note on readme and changelog that py2.7 support is dropped

[kapilt]

looks like starting with 3.1

[kapilt]

just noticed this #611

the case we saw this was actually the change to use importlib_metadata which uses more_itertools which dropped 2.7 support earlier this year.

Notice:      import jsonschema
Notice:    File "/home/cloud-custodian/custodian/lib/python2.7/site-packages/jsonschema/__init__.py", line 31, in <module>
Notice:      import importlib_metadata
Notice:    File "/home/cloud-custodian/custodian/lib/python2.7/site-packages/importlib_metadata/__init__.py", line 9, in <module>
Notice:      import zipp
Notice:    File "/home/cloud-custodian/custodian/lib/python2.7/site-packages/zipp.py", line 12, in <module>
Notice:      import more_itertools
Notice:    File "/home/cloud-custodian/custodian/lib/python2.7/site-packages/more_itertools/__init__.py", line 1, in <module>
Notice:      from more_itertools.more import *  # noqa
Notice:    File "/home/cloud-custodian/custodian/lib/python2.7/site-packages/more_itertools/more.py", line 340
Notice:      def _collate(*iterables, key=lambda a: a, reverse=False):
Notice:                                 ^
Notice:  SyntaxError: invalid syntax

[kapilt]

its also unclear if this project is supporting py2.7 why its not in the ci versions being tested.

[Julian]

2.7 is supported, and is still tested under CI, and is passing in CI (albeit we only test under PyPy these days, given it's the only Py2.7 that will continue to be supported past December 31).