add make pr (#672)

Author: guha-rahul

Makefile

@@ -14,6 +14,7 @@ help:
 	@echo "package-test - build package and install it in a venv for manual testing"
 	@echo "notes - consume towncrier newsfragments and update release notes in docs - requires bump to be set"
 	@echo "release - package and upload a release (does not run notes target) - requires bump to be set"
+	@echo "pr - run clean, fix, lint, typecheck, and test i.e basically everything you need to do before creating a PR"
 
 clean-build:
 	rm -fr build/
@@ -47,6 +48,8 @@ typecheck:
 test:
 	python -m pytest tests -n auto
 
+pr: clean fix lint typecheck test
+
 # protobufs management
 
 PB = libp2p/crypto/pb/crypto.proto \