README: arch install notes

[sjugge]

Rationale

Arch Linux does not support AUR helpers (ref), so the README should reflect the recommended install process.

I realize this is pedantic, but users should be guided towards the Arch way of installing AUR package, not towards an discontinued and unsupported AUR helper.

Code change

No code has been changed, only the README.md file has been altered.

[codecov]

Codecov Report

Merging #549 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #549      +/-   ##
==========================================
+ Coverage   45.55%   45.56%   +<.01%     
==========================================
  Files         234      234              
  Lines       40281    40277       -4     
==========================================
+ Hits        18350    18352       +2     
+ Misses      21931    21925       -6

Impacted Files	Coverage Δ
rm/tizrmd/src/tizrmowner.hpp	0% <0%> (ø)	⬆️
libtizplatform/src/ev/ev.c	26.49% <0%> (+0.17%)	⬆️

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[tizonia]

@sjugge

Thanks a lot!. I'm not a regular Arch user, so I'm not that familiar with the AUR installation mechanisms. So I had no idea that yaourt has become unmaintained!.

By the way, there is an issue in Tizonia's AUR installation process, which oftentimes breaks if there is an old version of Tizonia already installed on the system. The issue is documented here: #485

A user has suggested having a check for an existing installation of Tizonia in the build() step. See comment here:
https://aur.archlinux.org/packages/tizonia-all/

I'm looking for feedback on that issue from existing Arch users? Any ideas or suggestions?

[sjugge]

I was just having a look at the project, haven't installed yet but will probably do so soon.
I'm running Arch on most of my systems so I'll keep #485 in mind.