chore(package): update standard-version to version 6.0.1

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
     "jest": "^24.1.0",
     "npm-run-all": "^4.1.5",
     "rimraf": "^2.6.3",
-    "standard-version": "^5.0.2",
+    "standard-version": "^6.0.1",
     "ts-jest": "^24.0.2",
     "typescript": "^3.3.3333"
   },