Python 3.5 EOL is end of September 2020 (#609)

Author: hugovk

index.rst

@@ -103,7 +103,7 @@ Status of Python branches
 +------------------+--------------+-------------+----------------+----------------+-----------------------+
 | 3.6              | :pep:`494`   | security    | 2016-12-23     | *2021-12-23*   | Ned Deily             |
 +------------------+--------------+-------------+----------------+----------------+-----------------------+
-| 3.5              | :pep:`478`   | security    | 2015-09-13     | *2020-09-13*   | Larry Hastings        |
+| 3.5              | :pep:`478`   | security    | 2015-09-13     | *2020-09-30*   | Larry Hastings        |
 +------------------+--------------+-------------+----------------+----------------+-----------------------+
 
 .. Remember to update the end-of-life table in devcycle.rst.