Merge pull request #21 from bstavroulakis/renovate/pin-dependencies

refactor(deps): pin dependencies

Author: bstavroulakis

package-lock.json

@@ -88,14 +88,14 @@
     "mocha": "4.0.1",
     "node-sass": "4.5.3",
     "phantomjs-prebuilt": "2.1.15",
-    "purify-css": "^1.2.5",
+    "purify-css": "1.2.6",
     "purifycss": "1.2.6",
     "purifycss-webpack": "0.7.0",
     "recursive-readdir": "2.2.1",
     "rimraf": "2.6.2",
     "sass-loader": "6.0.6",
     "serve-favicon": "2.4.5",
-    "sinon": "^2.1.0",
+    "sinon": "2.4.1",
     "sinon-chai": "2.14.0",
     "url-loader": "0.6.2",
     "vue-loader": "13.3.0",