chore(package): update ajv to version 6.1.1

Author: greenkeeper[bot]

package.json

@@ -113,7 +113,7 @@
     "xml2js": "0.4.19"
   },
   "devDependencies": {
-    "ajv": "6.1.0",
+    "ajv": "6.1.1",
     "babel-core": "6.26.0",
     "babel-eslint": "8.2.1",
     "babel-jest": "22.1.0",