doc: add vim-easycomplete support for yaml-lsp

![](https://gw.alicdn.com/imgextra/i1/O1CN01VkVZxF1JGVCRvWV74_!!6000000001001-2-tps-779-492.png)

MoreInfo: <https://github.com/jayli/vim-easycomplete>

Author: jayli

README.md

@@ -360,6 +360,7 @@ This repository only contains the server implementation. Here are some known cli
 - [vim-lsp](https://github.com/prabirshrestha/vim-lsp) for Vim
 - [LSP-yaml](https://packagecontrol.io/packages/LSP-yaml) for Sublime Text
 - [monaco-yaml](https://monaco-yaml.js.org) for Monaco editor
+- [Vim-EasyComplete](https://github.com/jayli/vim-easycomplete) for Vim/NeoVim
 
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