chore(package): update @types/sinon to version 2.1.2 (#390)

https://greenkeeper.io/

package.json

@@ -125,7 +125,7 @@
     "@types/mime": "0.0.29",
     "@types/request": "0.0.42",
     "@types/node": "7.0.12",
-    "@types/sinon": "2.1.1",
+    "@types/sinon": "2.1.2",
     "@types/ws": "0.0.39",
     "apiai": "4.0.1",
     "ava": "0.18.2",