chore: Update CHANGELOG.rst for 2.0.0

Merge pull request aws#300 from farleyb-amazon/update-version-1.7.1

Update version identifier to 1.7.1

chore: Update CHANGELOG.rst for 1.7.0

Merge pull request aws#194 from mattsb42-aws/141

1.4.1 release

apply autoformatting (aws#154)

Merge pull request aws#105 from mattsb42-aws/oops

fix logging issue

update 1.3.7 release date (aws#85)

Merge branch 'caching-staging' into prod-master