Bump pip version in tox virtualenv so it can install PyQt 5.14

BryceBeagle · BryceBeagle · commit 0a2a979df65f · 2020-03-14T23:49:33.000-07:00
diff --git a/tox.ini b/tox.ini
@@ -5,6 +5,7 @@ envlist = py36
 deps =
   mypy
   pytest
+  pip~=20.0
 commands = 
   mypy -p PyQt5-stubs
   pytest {posargs}
