Update grunt-open requirement from 0.2.3 to 0.2.4

Updates the requirements on [grunt-open](https://github.com/onehealth/grunt-open) to permit the latest version.
- [Release notes](https://github.com/onehealth/grunt-open/releases)
- [Commits](jsoverson/grunt-open@v0.2.3...v0.2.4)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -17,7 +17,7 @@
     "grunt-contrib-uglify": "~4.0.1",
     "grunt-contrib-watch": "~1.0.0",
     "grunt-exec": "~1.0.1",
-    "grunt-open": "0.2.3",
+    "grunt-open": "0.2.4",
     "matchdep": "~1.0.1"
   }
 }