make sure changes are committed before release

Author: AlexanderWillner

Makefile

@@ -103,6 +103,8 @@ feedback: ## Give feedback
 
 release: build ## Create a new release
 	@type gh >/dev/null 2>&1 || (echo "Run e.g. 'brew install gh' first." >&2 ; exit 1)
+	@echo "Checking for not committed changes..."
+	@git diff --exit-code && git diff --cached --exit-code
 	@echo "########################"
 	@echo Making release for version "$(VERSION)". Press ENTER to continue...
 	@echo "########################"