fix(package): update @firebase/auth to version 0.13.1

Closes #610

Author: greenkeeper[bot]

package.json

@@ -18,7 +18,7 @@
   },
   "dependencies": {
     "@firebase/app": "^0.3.4",
-    "@firebase/auth": "^0.7.7",
+    "@firebase/auth": "^0.13.1",
     "@firebase/database": "^0.3.6",
     "@firebase/messaging": "^0.3.6",
     "@firebase/storage": "^0.2.3",