Update README

- Bump Neovim version (following nvim-treesitter's latest changes)
- Remove Packer, since it's currently unmaintained

README.md

@@ -17,7 +17,7 @@
 
 
 ## Requirements
-* Neovim ≥ 0.8
+* Neovim ≥ 0.9.2
 * `termguicolors` enabled
 * A terminal emulator or GUI with true color and font variants support (italics, bold, etc).
 
@@ -30,11 +30,6 @@ You can install Melange with any (Neo)Vim plugin manager.
 "savq/melange-nvim";
 ```
 
-[Packer](https://github.com/wbthomason/packer.nvim):
-```lua
-use "savq/melange-nvim"
-```
-
 [Lazy](https://github.com/folke/lazy.nvim):
 ```
 { "savq/melange-nvim" }