fix: Merge mainline into keyrings, reverting the keyring reverts#209

Merged

acioc merged 9 commits intoaws:keyringfrom

Aug 6, 2020

Commits on May 26, 2020

fix: validate entire ciphertext has been processed before returning (#191)
WesleyRosenblum
authored
Updating version for 1.6.2 release (#192)
WesleyRosenblum
authored

Commits on Aug 5, 2020

Revert "Merge pull request #189 from mattsb42-aws/revert"
Alex Cioc
committed

Commits on Aug 6, 2020

Replace failing Assert.fails with assertThrows per earlier PR changes
Alex Cioc
committed