Makefile: split publish target to version + publish (#524)

Author: andrewfrench

Makefile

@@ -1,9 +1,11 @@
-publish:
+version:
 	@poetry version $(v)
 	@git add pyproject.toml
 	@git commit -m "Version bump v$$(poetry version -s)"
+	@git push origin release/v$$(poetry version -s)
+
+publish:
 	@git tag v$$(poetry version -s)
-	@git push
 	@git push --tags
 	@poetry build
-	@poetry publish
+	@poetry publish