pin grunt-contrib-compress to 1.4.0

Author: felixerdy

package.json

@@ -19,7 +19,7 @@
     "grunt-bower-install": "~1.6.0",
     "grunt-concurrent": "~2.1.0",
     "grunt-contrib-clean": "~0.7.0",
-    "grunt-contrib-compress": "^1.4.0",
+    "grunt-contrib-compress": "1.4.0",
     "grunt-contrib-concat": "~0.5.1",
     "grunt-contrib-connect": "^0.11.2",
     "grunt-contrib-copy": "~0.8.2",