Update frontend dependecies

@vue/cli 3.8.4 --> 3.9.1 (incl. Vue Plugins)
vue-router 3.0.6 --> 3.0.7
bootstrap-vue 2.0.0-rc.24 --> 2.0.0-rc.25

README.md

@@ -5,9 +5,9 @@
 [![License](http://img.shields.io/:license-mit-blue.svg)](https://github.com/jonashackt/spring-boot-vuejs/blob/master/LICENSE)
 [![versionspringboot](https://img.shields.io/badge/springboot-2.1.6_RELEASE-brightgreen.svg)](https://github.com/spring-projects/spring-boot)
 [![versionjava](https://img.shields.io/badge/jdk-8,_9,_11-brightgreen.svg?logo=java)](https://github.com/spring-projects/spring-boot)
-[![versionnodejs](https://img.shields.io/badge/nodejs-v11.14.0-brightgreen.svg?logo=node.js)](https://nodejs.org/en/)
 [![versionvuejs](https://img.shields.io/badge/vue.js-2.6.10-brightgreen.svg?logo=vue.js)](https://vuejs.org/)
-[![versionvuecli](https://img.shields.io/badge/vue_CLI-3.8.4-brightgreen.svg?logo=vue.js)](https://cli.vuejs.org/)
+[![versionvuecli](https://img.shields.io/badge/vue_CLI-3.9.1-brightgreen.svg?logo=vue.js)](https://cli.vuejs.org/)
+[![versionnodejs](https://img.shields.io/badge/nodejs-v11.14.0-brightgreen.svg?logo=node.js)](https://nodejs.org/en/)
 [![versionwebpack](https://img.shields.io/badge/webpack-4.28.4-brightgreen.svg?logo=webpack)](https://webpack.js.org/)
 [![versionaxios](https://img.shields.io/badge/axios-0.18.0-brightgreen.svg)](https://github.com/axios/axios)
 [![versionjest](https://img.shields.io/badge/jest-23.6.0-brightgreen.svg?logo=jest)](https://jestjs.io/)