Update black commands in Makefile to check only .py files

Author: hawflau

Makefile

@@ -9,10 +9,10 @@ test:
 	pytest --cov samtranslator --cov-report term-missing --cov-fail-under 95 tests
 
 black:
-	black setup.py samtranslator/* tests/* bin/*.py
+	black setup.py samtranslator/**/*.py tests/**/*.py bin/*.py
 
 black-check:
-	black --check setup.py samtranslator/* tests/* bin/*.py
+	black --check setup.py samtranslator/**/*.py tests/**/*.py bin/*.py
 
 # Command to run everytime you make changes to verify everything works
 dev: test