Show error codes on mypy failures

Bob Green · Bob Green · commit d2f28d1177f8 · 2021-08-19T12:48:49.000-04:00
diff --git a/Makefile b/Makefile
@@ -16,7 +16,7 @@ flake8:
 	@flake8 --ignore=E741,W503,W504 backoff tests
 
 mypy:	
-	@mypy backoff tests
+	@mypy --show-error-codes backoff tests
 
 clean:
 	@find . -name "*.pyc" -delete
