* Multi-document support for YAML files
* Support referencing AWS KMS keys by their alias
* Support for INI files
* Support for AWS CLI profiles
* Comment support in .env files
* Added vi to the list of known editors
* Added a way to specify the GPG key server to use through the
  SOPS_GPG_KEYSERVER environment variable

Bug fixes:

* Now uses /Users/autrilla instead of ~ (which didn't work) to find the GPG home
* Fix panic when vim was not available as an editor, but other
  alternative editors were
* Fix issue with AWS KMS Encryption Contexts (#445) with more than one
  context value failing to decrypt intermittently. Includes an
  automatic fix for old files affected by this issue.

Project infrastructure changes:

* Added integration tests for AWS KMS
* Added Code of Conduct