[Nix-dev] Bump tmux version

[Lluís Batlle i Rossell]

On Mon, Jan 09, 2012 at 08:20:04PM -0800, Phil Hagelberg wrote:
> 
> Hello. I've noticed tmux 1.3 has a number of annoying bugs that seem to
> be fixed in 1.5. I've attached a patch that bumps the version number and
> updates the hash. I've just started using nix, so apologies if this
> isn't how package upgrade submissions are handled.

Committed! Thank you!