New Rules
- Add UseAssertIsNotNoneRule [144](https://github.com/Instagram/Fixit/pull/144)
- Add MissingHeaderRule to check copyright header comments [142](https://github.com/Instagram/Fixit/pull/142)
- Add NoStringTypeAnnotationRule [140](https://github.com/Instagram/Fixit/pull/140)
- Add NoNamedTupleRule [136](https://github.com/Instagram/Fixit/pull/136)
- Add NoAssertTrueForComparisonsRule to catch some incorrect uses of assertTrue() [135](https://github.com/Instagram/Fixit/pull/135)
- Add CollapseIsinstanceChecksRule [116](https://github.com/Instagram/Fixit/pull/116)
- Add NoUnnecessaryFormatStringRule and UseFstringRule [101](https://github.com/Instagram/Fixit/pull/101)
- Add NoRedundantLambdaRule. [112](https://github.com/Instagram/Fixit/pull/112)
Added
- add_new_rule CLI for adding new rule file [123](https://github.com/Instagram/Fixit/pull/123), [#131](https://github.com/Instagram/Fixit/pull/131)
Updated
- Ensure first lines remain intact with AddMissingHeaderRule [143](https://github.com/Instagram/Fixit/pull/143)
- Documentation improvements: [113](https://github.com/Instagram/Fixit/pull/113), [#117](https://github.com/Instagram/Fixit/pull/117),
[118](https://github.com/Instagram/Fixit/pull/118), [#120](https://github.com/Instagram/Fixit/pull/120)
[133](https://github.com/Instagram/Fixit/pull/133), [#138](https://github.com/Instagram/Fixit/pull/138)
- Improve test message [137](https://github.com/Instagram/Fixit/pull/137)