tig: install a more recent version

I noticed that tig 2.5.1 that is provided by Ubuntu 20.04 repositories has inferior bash completion than older versions after a complete rewrite Show archive.org snapshot . Newer versions, however, received some fixes. This inspired me to upgrade tig.

The official debian repositories have more recent versions of tig than Ubuntu does.

• remove your current version of tig: sudo apt purge tig
• go to http://deb.debian.org/debian/pool/main/t/tig/ Show archive.org snapshot and download the desired version for your machine (e.g. tig_2.5.5-1_amd64.deb)
• install it:

Copysudo dpkg -i tig_2.5.5-1_amd64.deb