remve cli-plugin-jest

package.json

@@ -74,7 +74,6 @@
     "@vue/babel-plugin-transform-vue-jsx": "^1.2.1",
     "@vue/cli-plugin-babel": "3.5.3",
     "@vue/cli-plugin-eslint": "^3.9.1",
-    "@vue/cli-plugin-unit-jest": "3.5.3",
     "@vue/cli-service": "3.5.3",
     "@vue/test-utils": "1.0.0-beta.29",
     "autoprefixer": "^9.5.1",