chore(package): update yargs to version 12.0.1 (#292)

Author: greenkeeper[bot]

package.json

@@ -53,6 +53,6 @@
     "standard-version": "^4.3.0",
     "swagger-js-codegen": "^1.12.0",
     "typescript": "^2.6.1",
-    "yargs": "^11.0.0"
+    "yargs": "^12.0.1"
   }
 }