chore: normalize repository package.json property

Author: Belco90

package.json

@@ -16,7 +16,7 @@
 	},
 	"repository": {
 		"type": "git",
-		"url": "https://github.com/testing-library/eslint-plugin-testing-library"
+		"url": "git+https://github.com/testing-library/eslint-plugin-testing-library.git"
 	},
 	"license": "MIT",
 	"author": {