chore(package): update @vue/cli-service to version 4.0.5

Closes #40

Author: greenkeeper[bot]

package.json

@@ -21,7 +21,7 @@
     "@vue/cli-plugin-babel": "^3.4.0",
     "@vue/cli-plugin-eslint": "^3.4.0",
     "@vue/cli-plugin-pwa": "^3.4.0",
-    "@vue/cli-service": "^3.4.0",
+    "@vue/cli-service": "^4.0.5",
     "babel-eslint": "^10.0.1",
     "eslint": "^6.0.0",
     "eslint-plugin-vue": "^5.0.0",