chore(package): update @vue/cli-plugin-unit-jest to version 4.2.3

Closes #26

Author: greenkeeper[bot]

package.json

@@ -22,8 +22,8 @@
   "devDependencies": {
     "@vue/cli-plugin-babel": "^3.6.0",
     "cz-conventional-changelog": "^3.0.0",
-    "@vue/cli-plugin-eslint": "^4.0.0",
-    "@vue/cli-plugin-unit-jest": "^3.6.0",
+    "@vue/cli-plugin-eslint": "^3.6.0",
+    "@vue/cli-plugin-unit-jest": "^4.2.3",
     "@vue/cli-service": "^3.6.0",
     "@vue/eslint-config-prettier": "^4.0.1",
     "@vue/test-utils": "1.0.0-beta.29",