Description of problem:
The URL of the tmux package is incorrect. Source0 should also be adapted

Version-Release number of selected component (if applicable):
2.2-1.fc25

How reproducible:
always

Steps to Reproduce:
1. Try to access either URL or Source0

Actual results:
Error 404

Expected results:
Load successfully

Additional info:
This is what their values should be:
URL:            https://tmux.github.io/
Source0:        https://github.com/tmux/%{name}/releases/download/%{version}/%{name}-%{version}.tar.gz