Merge pull request #300 from textpattern/dependabot/npm_and_yarn/grunt-contrib-uglify-5.0.0

Bump grunt-contrib-uglify from 4.0.1 to 5.0.0

Author: philwareham

package.json

@@ -18,7 +18,7 @@
     "grunt-contrib-clean": "2.0.0",
     "grunt-contrib-copy": "1.0.0",
     "grunt-contrib-jshint": "2.1.0",
-    "grunt-contrib-uglify": "4.0.1",
+    "grunt-contrib-uglify": "5.0.0",
     "grunt-contrib-watch": "1.1.0",
     "grunt-postcss": "0.9.0",
     "grunt-replace-regex": "1.0.3",