Merge pull request #27 from apiaryio/greenkeeper/mocha-6.0.0

chore(package): update mocha to version 6.0.0

Author: honzajavorek

package.json

@@ -20,7 +20,7 @@
   },
   "devDependencies": {
     "chai": "4.1.2",
-    "mocha": "5.0.4"
+    "mocha": "6.0.0"
   },
   "keywords": [
     "curl",