Use ^ for all devdeps

Author: jonnor

package.json

@@ -22,14 +22,14 @@
   },
   "devDependencies": {
     "amqplib": "^0.5.1",
-    "chai": "~4.1.0",
-    "grunt": "~1.0.1",
+    "chai": "^4.1.0",
+    "grunt": "^1.0.1",
     "coffee-script": "^1.8.0",
-    "grunt-coffeelint": "~0.0.6",
+    "grunt-coffeelint": "^0.0.6",
     "grunt-contrib-coffee": "^1.0.0",
     "grunt-mocha-test": "^0.13.2",
     "grunt-shell-spawn": "^0.3.1",
-    "mocha": "~4.0.0",
+    "mocha": "^4.0.0",
     "mqtt": "^2.7.1"
   },
   "keywords": [],