fix(package): update yargs to version 14.0.0

Author: greenkeeper[bot]

package.json

@@ -101,7 +101,7 @@
     "cheerio": "^1.0.0-rc.2",
     "figlet": "^1.2.1",
     "fs-extra": "^8.1.0",
-    "yargs": "^13.2.1"
+    "yargs": "^14.0.0"
   },
   "devDependencies": {
     "@babel/core": "^7.5.5",