chore(build): auto-generate vimdoc (#119)

Author: github-actions[bot]

doc/img-clip.nvim.txt

@@ -40,7 +40,7 @@ FEATURES                                *img-clip.nvim-img-clip.nvim-features*
 REQUIREMENTS                        *img-clip.nvim-img-clip.nvim-requirements*
 
 - **Linux:** xclip <https://github.com/astrand/xclip> (x11) or wl-clipboard <https://github.com/bugaevc/wl-clipboard> (wayland)
-- **MacOS:** pngpaste <https://github.com/jcsalterego/pngpaste> (optional, but recommended)
+- **MacOS:** pngpaste <https://github.com/jcsalterego/pngpaste>
 - **Windows:** No additional requirements