fix(deps): update dependency yargs to v13 (#213)

renovate[bot] · callmehiphop · commit 1b5bebb5f7f3 · 2019-02-12T09:07:32.000-08:00
diff --git a/monitoring/snippets/package.json b/monitoring/snippets/package.json
@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@google-cloud/monitoring": "^0.7.0",
-    "yargs": "^12.0.0"
+    "yargs": "^13.0.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",
