Bump typed-ast from 1.4.0 to 1.4.1 (#25)

Bumps [typed-ast](https://github.com/python/typed_ast) from 1.4.0 to 1.4.1.
- [Release notes](https://github.com/python/typed_ast/releases)
- [Changelog](https://github.com/python/typed_ast/blob/master/release_process.md)
- [Commits](python/typed_ast@1.4.0...1.4.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

requirements.txt

@@ -4,5 +4,5 @@ mccabe==0.6.1
 mypy==0.761
 pycodestyle==2.5.0
 pyflakes==2.1.1
-typed-ast==1.4.0
+typed-ast==1.4.1
 wheel==0.33.6