v7.2.1: The last version with support for nvim buffer preview & bat themes auto-generation

[linrongbin16]

This is the last version with support for nvim buffer preview & bat themes auto-generation.

Since it requires quite a effort to maintain two previewer implementations at the same time, i.e. the fzf native preview window (--preview-window), and the nvim buffer previewer. Finally I decide to drop both nvim buffer previewer and auto-generated bat themes.

In the future work, I will use fzf's preview window as the only previewer for this plugin, which could be much more easier to maintain, but could be quiet uncomfortable looking.

Personally I would recommend fzf-lua as an alternative, which has a great previewing performance via nvim buffer (tested on my macbook pro).