bump load-grunt-tasks to ~2.0.0

package.json

@@ -56,7 +56,7 @@
     "grunt-jscs": "~1.0.0",
     "grunt-saucelabs": "~8.4.0",
     "grunt-sed": "~0.1.1",
-    "load-grunt-tasks": "~1.0.0",
+    "load-grunt-tasks": "~2.0.0",
     "npm-shrinkwrap": "^200.0.0",
     "remarkable": "~1.6.0",
     "time-grunt": "~1.0.0"