update subtests module skip TODO

Author: bjlittle

tests/subtests/test_subtest.py

@@ -4,15 +4,14 @@
 import subprocess
 from pathlib import Path
 
-import matplotlib
 import matplotlib.ft2font
 import pytest
 from packaging.version import Version
 
 from .helpers import assert_existence, diff_summary, patch_summary
 
-# TODO: raise issue and quote URL here
-pytest.skip(reason="temporarily disable sub-tests", allow_module_level=True)
+# TODO: Remove this skip, see issue https://github.com/matplotlib/pytest-mpl/issues/159
+pytest.skip(reason="temporarily disabled sub-tests", allow_module_level=True)
 
 # Handle Matplotlib and FreeType versions
 MPL_VERSION = Version(matplotlib.__version__)