Merge pull request #22 from bstavroulakis/renovate/sinon-3.x

chore(deps): update dependency sinon to v3

Author: bstavroulakis

package-lock.json

@@ -95,7 +95,7 @@
     "rimraf": "2.6.2",
     "sass-loader": "6.0.6",
     "serve-favicon": "2.4.5",
-    "sinon": "2.4.1",
+    "sinon": "3.3.0",
     "sinon-chai": "2.14.0",
     "url-loader": "0.6.2",
     "vue-loader": "13.3.0",