add mfussenegger/nvim-lint (#247)

README.md

@@ -143,6 +143,7 @@ Neovim supports a wide variety of UI's.
 - [jakewvincent/texmagic.nvim](https://github.com/jakewvincent/texmagic.nvim) - Enhance the lspconfig settings for Texlab by defining any number of custom LaTeX build engines and selecting them with magic comments.
 - [nanotee/nvim-lsp-basics](https://github.com/nanotee/nvim-lsp-basics) - Basic wrappers for LSP features.
 - [weilbith/nvim-code-action-menu](https://github.com/weilbith/nvim-code-action-menu) - A floating pop-up menu for code actions to show code action information and a diff preview.
+- [mfussenegger/nvim-lint](https://github.com/mfussenegger/nvim-lint) - An asynchronous linter plugin for Neovim (>= 0.5) complementary to the built-in Language Server Protocol support.
 
 ##### LSP Installer