Update typed-ast to 1.5.4

[pyup-bot]

This PR updates typed-ast from 1.4.1 to 1.5.4.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/typed-ast
• Repo: https://github.com/python/typed_ast

[codecov[bot]]

Codecov Report

Merging #119 (669101c) into master (30ca807) will increase coverage by 0.54%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
+ Coverage   99.07%   99.61%   +0.54%     
==========================================
  Files          20       20              
  Lines        1294     1294              
==========================================
+ Hits         1282     1289       +7     
+ Misses         12        5       -7     

Impacted Files	Coverage Δ
paroxython/flatten_ast.py	100.00% <0.00%> (+6.36%)	:arrow_up:

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