Bump mypy from 0.782 to 0.790 (#43)

Bumps [mypy](https://github.com/python/mypy) from 0.782 to 0.790.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.782...v0.790)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 entrypoints==0.3
 flake8==3.8.4
 mccabe==0.6.1
-mypy==0.782
+mypy==0.790
 pycodestyle==2.6.0
 pyflakes==2.2.0
 typed-ast==1.4.1