升级@vue/cli-service到最新版本，修复element-plus升级到新版本后，构建错误 (#525)

* 升级vue以及element-plus到最新版本

* 升级@vue/cli-service到最新版本，修复element-plus升级到新版本后，构建错误

Co-authored-by: liulihan <[email protected]>

Author: NightMingGit

package.json

@@ -43,7 +43,7 @@
     "@vue/cli-plugin-babel": "~4.5.0",
     "@vue/cli-plugin-eslint": "~4.5.0",
     "@vue/cli-plugin-unit-jest": "~4.5.0",
-    "@vue/cli-service": "~4.5.0",
+    "@vue/cli-service": "~4.5.15",
     "@vue/compiler-sfc": "^3.0.0",
     "@vue/eslint-config-airbnb": "^4.0.1",
     "@vue/test-utils": "^2.0.0-beta.8",