1.1.1

1.1.0 was cut before realizing that PyYAML 5.2 addressed some issues with PyYAML 5.1. This release has a single change to use 5.2 instead: c806470

1.1.0

• Update requirements.txt to pin PyYAML to 5.1 (6dd59f5)
• Use yaml.safe_load instead of yaml.load (77dcf4e)
• Drop official support for Python 3.5. Things are likely to continue working fine, but there may be future breakage.