chore(package): update @vue/cli-service to version 4.0.3

Closes #27

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
     "cz-conventional-changelog": "^3.0.0",
     "@vue/cli-plugin-eslint": "^3.6.0",
     "@vue/cli-plugin-unit-jest": "^3.6.0",
-    "@vue/cli-service": "^3.6.0",
+    "@vue/cli-service": "^4.0.3",
     "@vue/eslint-config-prettier": "^4.0.1",
     "@vue/test-utils": "1.0.0-beta.29",
     "babel-core": "7.0.0-bridge.0",