Use latest version of mypy and fix type hinting accordingly (#1239)

* Use latest version of mypy and fix type hinting accordingly

Also:
- Update Pipfile to never require mock since we only support Python 3.6+
- Remove Azure Pipelines badge from Readme and fix section links there
- Added an "inv format" task to run black and isort to auto-format all code before a commit

* Try to fix type errors on versions prior to 3.8

* Restored correct types in argparse_custom.py

1 files changed, 2 insertions, 2 deletions

diff --git a/setup.py b/setup.py
index 9c133df9..591ba9f8 100755
--- a/setup.py
+++ b/setup.py
@@ -68,7 +68,7 @@ EXTRAS_REQUIRE = {
         'doc8',
         'flake8',
         'invoke',
-        'mypy==0.902',
+        'mypy',
         'nox',
         "pytest>=4.6",
         'pytest-cov',
@@ -80,7 +80,7 @@ EXTRAS_REQUIRE = {
     ],
     'validate': [
         'flake8',
-        'mypy==0.902',
+        'mypy',
         'types-pkg-resources',
     ],
 }