add a reminder to add GitHub release notes when I do a release

Author: radix

Makefile

@@ -8,8 +8,10 @@ build-dist:
 upload-dist:
 	twine upload dist/*
 	echo
-	echo "Don't forget to add a git tag."
-	echo "And don't forget to bump the version in setup.py and docs/source/conf.py."
+	echo "Don't forget to:"
+	echo "- add a git tag."
+	echo "- add release notes to GitHub"
+	echo "- bump the version in setup.py and docs/source/conf.py."
 
 doc:
 	rm -rf docs/build