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

Author: renovate-bot

package.json

@@ -61,7 +61,7 @@
     "react": "16.8.6",
     "rimraf": "2.6.3",
     "source-map-support": "0.5.12",
-    "standard-version": "5.0.2",
+    "standard-version": "6.0.1",
     "tslint": "5.16.0",
     "typescript": "3.4.5"
   },