Let users change mapping to open menu

[victorkristof]

Hi there,

Super nice plugin, well done :tada:

I am wondering whether you could add an option to let the user set up their own mapping to open the menu?

I have prefix s set to split the window, and I would like to keep it like this.

Thank you!

[EDIT]: Just saw that pull request #1 is implementing exactly this 😄

[l1ch40]

I modify the tmux-spotify.tmux