Log Message:
textproc/git-delta: update to 0.18.1

This patch release fixes an issue with delta --version that was causing problems \ 
downstream (#1818).
What's Changed
 - Add hyperlinks section to manual by @dandavison in #1816
 - Added platypus theme by @sarpuser in #1819
 - Don't use pager for --version by @dandavison in #1824