Bump typed-ast from 1.3.5 to 1.4.0
Bump typed-ast from 1.3.5 to 1.4.0

Bumps [typed-ast](https://github.com/python/typed_ast) from 1.3.5 to 1.4.0.
- [Release notes](https://github.com/python/typed_ast/releases)
- [Changelog](https://github.com/python/typed_ast/blob/master/release_process.md)
- [Commits](https://github.com/python/typed_ast/compare/1.3.5...1.4.0)
craiga/unixtimesta.mp,craiga/unixtimesta.mp,craiga/unixtimesta.mp