Clean plugins too

clean.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 source venv/bin/activate
 set -e
-isort --profile black *.py lib/*.py
-black -l 80 *.py lib/*.py
-flynt *.py lib/*.py
-mypy esl_reader.py
+isort --profile black *.py lib/*.py plugins/*.py
+black -l 80 *.py lib/*.py plugins/*.py
+flynt *.py lib/*.py plugins/*.py
+mypy esl_reader.py plugins/*.py