update README to include lsp-json

Author: kiennq

README.org

@@ -158,6 +158,7 @@
    | JavaScript/TypeScript | [[https://github.com/theia-ide/typescript-language-server][typescript-language-server]]  (recommended) | Yes           | npm i -g typescript-language-server; npm i -g typescript                                                | Yes (Firefox/Chrome)         |
    | JavaScript/TypeScript | [[https://github.com/sourcegraph/javascript-typescript-langserver][javascript-typescript-stdio]]               | Yes           | npm i -g javascript-typescript-langserver                                                               | Yes (Firefox/Chrome)         |
    | JavaScript Flow       | [[https://flow.org][flow]] (add-on if working on a Flow file)   | Yes           | [[https://flow.org][flow]]                                                                                                    | Yes (Firefox/Chrome)         |
+   | Json                  | [[https://github.com/vscode-langservers/vscode-json-languageserver][vscode-json-languageserver]]                | Yes           | Automatic or manual by ~npm i -g vscode-json-languageserver~                                            |                              |
    | Julia                 | [[https://github.com/non-Jedi/lsp-julia][lsp-julia]]                                 | [[https://github.com/non-Jedi/lsp-julia][lsp-julia]]     | [[https://github.com/JuliaEditorSupport/LanguageServer.jl][LanguageServer.jl]]                                                                                       |                              |
    | Kotlin                | [[https://github.com/fwcd/KotlinLanguageServer][kotlin-language-server]]                    | Yes           | [[https://github.com/fwcd/KotlinLanguageServer][kotlin-language-server]]                                                                                  |                              |
    | OCaml                 | [[https://github.com/ocaml-lsp/ocaml-language-server][ocaml-language-server]]                     | Yes           | [[https://github.com/ocaml-lsp/ocaml-language-server][ocaml-language-server]]                                                                                   |                              |
@@ -167,7 +168,7 @@
    | Powershell            | [[https://github.com/PowerShell/PowerShellEditorServices][PowerShellEditorServices]]                  | Yes           | Automatic                                                                                               | Yes                          |
    | Python                | [[https://github.com/palantir/python-language-server][pyls]]                                      | Yes           | pip install 'python-language-server[all]'                                                               | Yes                          |
    | Python(Microsoft)     | [[https://github.com/Microsoft/python-language-server][Microsoft Python Language Server]]          | [[https://github.com/emacs-lsp/lsp-python-ms][lsp-python-ms]] | [[https://github.com/emacs-lsp/lsp-python-ms][lsp-python-ms]]                                                                                           | Yes                          |
-   | R                     | [[https://github.com/REditorSupport/languageserver][languageserver]]                            | Yes           | install.packages("languageserver")                                                                                          | No                           |
+   | R                     | [[https://github.com/REditorSupport/languageserver][languageserver]]                            | Yes           | install.packages("languageserver")                                                                      | No                           |
    | Ruby                  | [[https://github.com/castwide/solargraph][solargraph]]                                | Yes           | gem install solargraph                                                                                  | Yes                          |
    | Rust                  | [[https://github.com/rust-lang/rls][rls]]                                       | Yes           | [[https://github.com/rust-lang/rls][rls]]                                                                                                     | Yes                          |
    | Rust                  | [[https://github.com/rust-analyzer/rust-analyzer][rust-analyzer]]                             | Yes           | [[https://github.com/rust-analyzer/rust-analyzer#language-server-quick-start][rust-analyzer]]                                                                                           |                              |