chore(package): update @vue/cli-plugin-unit-jest to version 4.2.2

Closes #26

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "@vue/cli-plugin-babel": "^3.6.0",
     "cz-conventional-changelog": "^3.0.0",
     "@vue/cli-plugin-eslint": "^3.6.0",
-    "@vue/cli-plugin-unit-jest": "^3.6.0",
+    "@vue/cli-plugin-unit-jest": "^4.2.2",
     "@vue/cli-service": "^3.6.0",
     "@vue/eslint-config-prettier": "^4.0.1",
     "@vue/test-utils": "1.0.0-beta.29",