chore(deps): update dependency standard-version to v6

Author: renovate-bot

package-lock.json

@@ -90,7 +90,7 @@
     "prettier": "1.17.0",
     "puppeteer": "1.15.0",
     "rimraf": "2.6.3",
-    "standard-version": "5.0.2",
+    "standard-version": "6.0.1",
     "style-loader": "0.23.1",
     "supertest": "4.0.2",
     "url-loader": "1.1.2",