Fixes CI with mypy error codes

sobolevn · sobolevn · commit 282a61caa9e8 · 2020-06-04T14:30:13.000+03:00
diff --git a/setup.cfg b/setup.cfg
@@ -148,7 +148,6 @@ warn_unreachable = True
 
 # We need this to debug `mypy` plugin:
 show_traceback = True
-show_error_codes = True
 
 
 [doc8]
