Bump mypy from 0.761 to 0.790

Bumps [mypy](https://github.com/python/mypy) from 0.761 to 0.790.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.761...v0.790)

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

setup.py

@@ -44,7 +44,7 @@
             "ddt==1.4.1",
             "matplotlib==3.1.2",
             "mock==3.0.5",
-            "mypy==0.761",
+            "mypy==0.790",
             "nose==1.3.7",
             "pillow==7.0.0",
             "pycodestyle==2.5.0",