chore(package): update gulp-rev to version 9.0.0

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "gulp-img-retina": "0.0.4",
     "gulp-rename": "^1.2.2",
     "gulp-responsive": "^2.11.0",
-    "gulp-rev": "^8.0.0",
+    "gulp-rev": "^9.0.0",
     "gulp-rev-replace": "^0.4.3",
     "gulp-sass": "latest",
     "gulp-sourcemaps": "^2.6.4",