Mention tmux version required

plugins/README.md

@@ -62,7 +62,7 @@ Plugins are installed to `${XDG_CONFIG_HOME:-$HOME/.config}/nnn/plugins`.
 | pdfview | View PDF file in `$PAGER` | sh | pdftotext/<br>mupdf-tools |
 | picker | Pick files and list one per line (to pipe) | sh | nnn |
 | preview-tabbed | `tabbed`/xembed based file previewer | bash | _see in-file docs_ |
-| preview-tui | Simple TUI file previewer (needs NNN_FIFO) | sh | tmux/xterm/<br>\$TERMINAL, file, tree |
+| preview-tui | Simple TUI file previewer (needs NNN_FIFO) | sh | tmux (>= 3.0)/xterm/<br>\$TERMINAL, file, tree |
 | pskill | Fuzzy list by name and kill process or zombie | sh | fzf, ps, sudo/doas |
 | renamer | Batch rename selection or files in dir | sh | [qmv](https://www.nongnu.org/renameutils/)/[vidir](https://joeyh.name/code/moreutils/) |
 | ringtone | Create a variable bitrate mp3 ringtone from file | sh | date, ffmpeg |