docs: list "folke/trouble.nvim" as dependency (jackMort#357)

To correctly execute the command:

```
ChatGPTRun code_readability_analysis
```

It is necessary to have the "trouble.nvim" plugin.

Otherwise you get the nvim error saying:

```
Vim:E492: Not an editor command: Trouble quickfix
```

This commit makes it explicit in the README that trouble plugin is a
dependency.

README.md

@@ -61,6 +61,7 @@ use({
     requires = {
       "MunifTanjim/nui.nvim",
       "nvim-lua/plenary.nvim",
+      "folke/trouble.nvim",
       "nvim-telescope/telescope.nvim"
     }
 })
@@ -75,6 +76,7 @@ use({
     dependencies = {
       "MunifTanjim/nui.nvim",
       "nvim-lua/plenary.nvim",
+      "folke/trouble.nvim",
       "nvim-telescope/telescope.nvim"
     }
 }