Include new nvim-treesitter instructions (#139)

Author: keidax

README.md

@@ -10,15 +10,53 @@ Hopefully support for this parser will be upstreamed by editors soon. At the mom
 
 ### Neovim
 
-0. Set up the [nvim-treesitter](https://github.com/nvim-treesitter/nvim-treesitter) plugin.
+0. Set up the [nvim-treesitter](https://github.com/nvim-treesitter/nvim-treesitter/tree/main) plugin.
+
+#### For nvim-treesitter v0.10 or newer (recommended)
+
+1. Include this lua snippet in your neovim setup:
+
+   ```lua
+   vim.api.nvim_create_autocmd("User", {
+     pattern = 'TSUpdate',
+     callback = function()
+       require('nvim-treesitter.parsers').crystal = {
+         install_info = {
+           url = 'https://github.com/crystal-lang-tools/tree-sitter-crystal',
+           -- path = '<ts-crystal-install-path>', -- if you want to use a local version instead
+           generate = false,
+           generate_from_json = false,
+           queries = 'queries/nvim'
+         },
+       }
+     end,
+   })
+
+   vim.treesitter.language.register("crystal", { "cr" })
+   ```
+
+2. Restart neovim and run `:TSUpdate`
+
+To confirm the grammar is functioning, run `:checkhealth nvim-treesitter` and look for this line:
+
+```
+- crystal             ✓ . ✓ . ✓
+```
+
+
+#### For older nvim-treesitter versions (aka the master branch)
+
 1. Check out this repo locally. Its location will be referred to as `<ts-crystal-install-path>`.
 2. In a terminal, navigate to wherever nvim-treesitter is installed (this will depend on your plugin manager). Run:
+
    ```bash
    mkdir queries/crystal
    cd queries/crystal
    ln -s <ts-crystal-install-path>/queries/nvim/*.scm .
    ```
+
 3. Include this lua snippet in your neovim setup:
+
    ```lua
    local parser_config = require "nvim-treesitter.parsers".get_parser_configs()
    parser_config.crystal = {
@@ -30,9 +68,5 @@ Hopefully support for this parser will be upstreamed by editors soon. At the mom
      filetype = "cr",
    }
    ```
-4. Restart neovim and run `:TSInstall crystal`
 
-To confirm the grammar is functioning, run `:checkhealth nvim-treesitter` and look for this line:
-```
-- crystal             ✓ . ✓ . ✓
-```
+4. Restart neovim and run `:TSInstall crystal`

queries/injections.scm

@@ -3,5 +3,4 @@
 
 (heredoc_body
   (literal_content) @injection.content
-  (heredoc_end) @injection.language
-  (#downcase! @injection.language))
+  (heredoc_end) @injection.language)

queries/nvim/injections.scm

@@ -7,8 +7,7 @@
 
 (heredoc_body
   (literal_content) @injection.content
-  (heredoc_end) @injection.language
-  (#downcase! @injection.language))
+  (heredoc_end) @injection.language)
 
 (macro_def
   body: (expressions) @injection.content