chore(package): update version-bump-prompt to version 6.0.0

Closes #24

Author: greenkeeper[bot]

package.json

@@ -31,6 +31,6 @@
     "ts-jest": "24.2.0",
     "tslint": "5.20.1",
     "typescript": "3.7.2",
-    "version-bump-prompt": "5.0.6"
+    "version-bump-prompt": "6.0.0"
   }
 }