Update README.md

Author: kb-coder

README.md

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 # vue-cli-plugin-workbox-pwa
+**THIS PLUGIN IS PROVIDED AS IS and will not be supported by this contributor. Please feel free to fork and adjust code as you need to for your projects or provide an updated version to the community.**
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 **BETA - submitted PR to Vue CLI https://github.com/vuejs/vue-cli/pull/6497**
 
 A Vue CLI Plugin with advanced support for workbox 6.x, Vue 3, and webpack 4. Includes the ability to debug the service worker locally.