Add helix as supported editor

README.md

@@ -6,6 +6,7 @@ You probably want to use this via one of these:
 - [vscode-jq](https://github.com/wader/vscode-jq)
 - neovim using [nvim-lspconfig](https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#jqls) and [mason.nvim](https://github.com/williamboman/mason.nvim)
 - [Emacs lsp-mode](https://github.com/emacs-lsp/lsp-mode)
+- [helix](https://github.com/helix-editor/helix) (only in master)
 
 It can currently do:
 - Syntax checking.