Update dev dependencies

Author: philwareham

package.json

@@ -22,17 +22,17 @@
     "grunt-cli": "~0.1",
     "grunt-concurrent": "2.2.1",
     "grunt-contrib-clean": "1.0.0",
-    "grunt-contrib-copy": "0.8.2",
-    "grunt-contrib-cssmin": "0.14.0",
+    "grunt-contrib-copy": "1.0.0",
+    "grunt-contrib-cssmin": "1.0.1",
     "grunt-contrib-jshint": "1.0.0",
-    "grunt-contrib-watch": "0.6.1",
+    "grunt-contrib-watch": "1.0.0",
     "grunt-dev-update": "1.4.0",
     "grunt-postcss": "0.7.2",
     "grunt-sass": "1.1.0",
     "grunt-sass-lint": "0.1.0",
     "load-grunt-tasks": "~3.4",
     "node-sass": "3.4.2",
-    "sass-lint": "1.5.0"
+    "sass-lint": "1.5.1"
   },
   "scripts": {
     "test": "grunt travis --verbose"