Update dependency yargs to v16 (#340)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package.json

@@ -29,7 +29,7 @@
     "postcss-reporter": "^6.0.0",
     "pretty-hrtime": "^1.0.3",
     "read-cache": "^1.0.0",
-    "yargs": "^15.0.2"
+    "yargs": "^16.0.0"
   },
   "devDependencies": {
     "ava": "^3.1.0",