Fix validation error type `SS05` and check in CI

[kynan]

Problem description

In order to have a continuous check by the CI on validation error SS05 (Summary must start with infinitive verb, not third person), fixing them in the code base enables the addition to the CI for automated testing in the future.

SS05 has just 52 occurrences (see overview of the errors):

method	file	file_line	github_link
pandas.core.resample.Resampler.get_group	pandas/core/groupby/groupby.py	626.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L626
pandas.core.resample.Resampler.nunique	pandas/core/resample.py	877.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L877
pandas.api.extensions.register_extension_dtype	pandas/core/dtypes/dtypes.py	19.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/dtypes/dtypes.py#L19
pandas.core.groupby.GroupBy.get_group	pandas/core/groupby/groupby.py	626.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L626
pandas.core.groupby.GroupBy.all	pandas/core/groupby/groupby.py	1059.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L1059
pandas.core.groupby.GroupBy.any	pandas/core/groupby/groupby.py	1046.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L1046
pandas.core.groupby.GroupBy.head	pandas/core/groupby/groupby.py	2039.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L2039
pandas.core.groupby.GroupBy.rank	pandas/core/groupby/groupby.py	1811.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L1811
pandas.core.groupby.GroupBy.tail	pandas/core/groupby/groupby.py	2067.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L2067
pandas.core.groupby.DataFrameGroupBy.all	pandas/core/groupby/groupby.py	1059.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L1059
pandas.core.groupby.DataFrameGroupBy.any	pandas/core/groupby/groupby.py	1046.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L1046
pandas.core.groupby.DataFrameGroupBy.rank	pandas/core/groupby/groupby.py	1811.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L1811
pandas.core.groupby.SeriesGroupBy.nunique	pandas/core/groupby/generic.py	1023.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/generic.py#L1023
pandas.plotting.andrews_curves	pandas/util/_decorators.py	272.0	https://github.com/pandas-dev/pandas/blob/master/pandas/util/_decorators.py#L272
pandas.Series.put	pandas/core/series.py	581.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/series.py#L581
pandas.Series.keys	pandas/core/series.py	1457.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/series.py#L1457
pandas.Series.lt	pandas/core/ops.py	1864.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/ops.py#L1864
pandas.Series.le	pandas/core/ops.py	1864.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/ops.py#L1864
pandas.Series.rolling	pandas/core/generic.py	10145.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L10145
pandas.Series.expanding	pandas/core/generic.py	10156.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L10156
pandas.Series.ewm	pandas/core/generic.py	10164.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L10164
pandas.Series.argsort	pandas/core/series.py	2988.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/series.py#L2988
pandas.Series.str.len	pandas/core/strings.py	1737.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/strings.py#L1737
pandas.Series.cat.rename_categories	pandas/core/accessor.py	94.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/accessor.py#L94
pandas.Series.cat.reorder_categories	pandas/core/accessor.py	94.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/accessor.py#L94
pandas.Series.cat.remove_categories	pandas/core/accessor.py	94.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/accessor.py#L94
pandas.Series.cat.remove_unused_categories	pandas/core/accessor.py	94.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/accessor.py#L94
pandas.Series.cat.set_categories	pandas/core/accessor.py	94.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/accessor.py#L94
pandas.Index.equals	pandas/core/indexes/base.py	4050.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/indexes/base.py#L4050
pandas.Index.asof_locs	pandas/core/indexes/base.py	4145.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/indexes/base.py#L4145
pandas.CategoricalIndex.rename_categories	pandas/core/accessor.py	94.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/accessor.py#L94
pandas.CategoricalIndex.reorder_categories	pandas/core/accessor.py	94.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/accessor.py#L94
pandas.CategoricalIndex.remove_categories	pandas/core/accessor.py	94.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/accessor.py#L94
pandas.CategoricalIndex.remove_unused_categories	pandas/core/accessor.py	94.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/accessor.py#L94
pandas.CategoricalIndex.set_categories	pandas/core/accessor.py	94.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/accessor.py#L94
pandas.CategoricalIndex.equals	pandas/core/indexes/category.py	233.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/indexes/category.py#L233
pandas.DatetimeIndex.indexer_at_time	pandas/core/indexes/datetimes.py	1285.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/indexes/datetimes.py#L1285
pandas.DataFrame.lt	pandas/core/ops.py	2059.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/ops.py#L2059
pandas.DataFrame.le	pandas/core/ops.py	2059.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/ops.py#L2059
pandas.DataFrame.rolling	pandas/core/generic.py	10145.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L10145
pandas.DataFrame.expanding	pandas/core/generic.py	10156.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L10156
pandas.DataFrame.ewm	pandas/core/generic.py	10164.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L10164
pandas.DataFrame.melt	pandas/core/frame.py	6106.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L6106
pandas.Panel.apply	pandas/core/panel.py	1000.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/panel.py#L1000
pandas.api.types.pandas_dtype	pandas/core/dtypes/common.py	1981.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/dtypes/common.py#L1981
pandas.Timestamp.now	None	NaN	https://github.com/pandas-dev/pandas/blob/master/None#LNone
pandas.melt	pandas/core/reshape/melt.py	21.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/reshape/melt.py#L21
pandas.io.stata.StataReader.data	pandas/io/stata.py	1430.0	https://github.com/pandas-dev/pandas/blob/master/pandas/io/stata.py#L1430
pandas.io.stata.StataReader.data_label	pandas/io/stata.py	1728.0	https://github.com/pandas-dev/pandas/blob/master/pandas/io/stata.py#L1728
pandas.io.stata.StataReader.value_labels	pandas/io/stata.py	1738.0	https://github.com/pandas-dev/pandas/blob/master/pandas/io/stata.py#L1738
pandas.io.stata.StataReader.variable_labels	pandas/io/stata.py	1732.0	https://github.com/pandas-dev/pandas/blob/master/pandas/io/stata.py#L1732
pandas.Series.ptp	pandas/core/generic.py	10943.0	https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L10943

Todo:

• get rid of the errors in the code base
• update the code_check.sh script to take into account the SS05 type of errors

[thoo]

I am working on this one.