upgrade mypy_extensions

rmorshea · rmorshea · commit 908d66ae026d · 2020-02-17T16:51:10.000-08:00
diff --git a/requirements/prod.txt b/requirements/prod.txt
@@ -1,3 +1,3 @@
 loguru ==0.3.2
 typing-extensions ==3.7.4
-mypy-extensions ==0.4.1
+mypy-extensions ==0.4.3
