chore(package): update alex to version 7.0.0

Closes #13

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "rxjs": "^5.5.6"
   },
   "devDependencies": {
-    "alex": "^5.0.0",
+    "alex": "^7.0.0",
     "babel-cli": "^6.10.1",
     "babel-core": "^6.13.2",
     "babel-eslint": "^8.0.0",