Update dev dependencies

Author: philwareham

package.json

@@ -20,15 +20,15 @@
     "autoprefixer": "6.4.0",
     "grunt": "~1.0",
     "grunt-cli": "~1",
-    "grunt-concurrent": "2.3.0",
+    "grunt-concurrent": "2.3.1",
     "grunt-contrib-clean": "1.0.0",
     "grunt-contrib-copy": "1.0.0",
     "grunt-contrib-cssmin": "1.0.1",
     "grunt-contrib-jshint": "1.0.0",
     "grunt-contrib-watch": "1.0.0",
     "grunt-dev-update": "2.0.0",
     "grunt-postcss": "0.8.0",
-    "grunt-sass": "1.2.0",
+    "grunt-sass": "1.2.1",
     "grunt-sass-lint": "0.2.0",
     "load-grunt-tasks": "~3.5",
     "node-sass": "3.8.0",