Bump mypy for py3.8 support

mypy depends on typed-ast which relatively recently added python 3.8
support. Unfortunately the mypy we were using requires an older
typed-ast and fails under python 3.8. Fix this by bumping mypy up to a
level where minimal code changes are necessary.

The code changes we made ignore type conflicts due to redefinition on
conditional imports. Comments include link back to a bug describing this
issue and workaround in mypy.

Change-Id: Iec69a27b16a1e09eb6bfbcf8d68deb1ae68d42a3

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 1811c3ab3..44fde724c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -53,7 +53,7 @@ install_command = pip install {opts} {packages}
 # type checking on the world - just on ourselves.
 deps =
   flake8
-  mypy<0.650
+  mypy<0.740
   openapi-spec-validator
 commands =
   flake8 {posargs}