chore(package): update gulp-watch to version 4.3.8

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -30,7 +30,7 @@
     "gulp-babel": "^5.0.0",
     "gulp-run": "^1.6.6",
     "gulp-sourcemaps": "^1.3.0",
-    "gulp-watch": "^4.1.0",
+    "gulp-watch": "^4.3.8",
     "mochify": "^2.2.0"
   }
 }