fix(package): update yargs to version 13.1.0

greenkeeper[bot] · pvdlg · commit aed4ea2edc1b · 2019-02-15T12:11:12.000-05:00
diff --git a/package.json b/package.json
@@ -44,7 +44,7 @@
     "resolve-from": "^4.0.0",
     "semver": "^5.4.1",
     "signale": "^1.2.1",
-    "yargs": "^12.0.0"
+    "yargs": "^13.1.0"
   },
   "devDependencies": {
     "ava": "^1.0.1",
