fix(package): update sort-keys to version 2.0.0 (#185)

Author: greenkeeper[bot]

package.json

@@ -65,7 +65,7 @@
     "promise-finally": "^3.0.0",
     "rc": "^1.1.5",
     "rimraf": "^2.4.4",
-    "sort-keys": "^1.0.0",
+    "sort-keys": "^2.0.0",
     "string-template": "^1.0.0",
     "strip-bom": "^3.0.0",
     "thenify": "^3.1.0",