chore(package): update gulp-watch to version 5.0.1

Closes #15

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
     "gulp-eslint": "^3.0.1",
     "gulp-mocha": "^3.0.1",
     "gulp-util": "^3.0.7",
-    "gulp-watch": "^4.3.5",
+    "gulp-watch": "^5.0.1",
     "mocha": "^3.1.2",
     "redux": "^3.0.4",
     "require-dir": "^0.3.0",