Merge pull request #539 from syuilo/revert-534-greenkeeper/@types/gulp-4.0.4

Revert "Update @types/gulp to the latest version 🚀"

package.json

@@ -34,7 +34,7 @@
 		"@types/event-stream": "3.3.31",
 		"@types/express": "4.0.35",
 		"@types/gm": "1.17.31",
-		"@types/gulp": "4.0.4",
+		"@types/gulp": "4.0.3",
 		"@types/gulp-mocha": "0.0.30",
 		"@types/gulp-rename": "0.0.32",
 		"@types/gulp-replace": "0.0.30",