Merge pull request #580 from devopsdays/greenkeeper/gulp-rev-8.0.0

Update gulp-rev to the latest version 🚀

Author: mattstratton

package.json

@@ -23,7 +23,7 @@
     "gulp-imagemin": "^3.1.1",
     "gulp-img-retina": "0.0.4",
     "gulp-responsive": "^2.7.0",
-    "gulp-rev": "^7.1.2",
+    "gulp-rev": "^8.0.0",
     "gulp-rev-replace": "^0.4.3",
     "gulp-useref": "^3.1.2",
     "require-dir": "^0.3.0",