Add documentation for --use-colour

[palotasb]

The documentation for --use-colour option was missing.

I added it based on the -? output a Catch test program gave me and the comments on #950

Description

GitHub Issues

[horenmar]

Huh, so it was. The linked issue does not seem correct though, did you mean #590 ?

[codecov]

Codecov Report

Merging #1263 into master will increase coverage by 0.83%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1263      +/-   ##
==========================================
+ Coverage   81.43%   82.27%   +0.83%     
==========================================
  Files         126      124       -2     
  Lines        4810     4761      -49     
==========================================
  Hits         3917     3917              
+ Misses        893      844      -49

[palotasb]

Oh yes, #590. Should I change the commit message or something? Martin Hořeňovský <[email protected]> (időpont: 2018. ápr. 26., Cs, 22:27) ezt írta:

…

Huh, so it was. The linked issue does not seem correct though, did you mean #590 <#590> ? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1263 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABpCjaLfYg3zyUhEKCajwX_m0CK_FZahks5tsi25gaJpZM4TjCWn> .

[horenmar]

The link in the commit message should go to the correct issue before it is merged to master.

Thanks for the PR btw.

[horenmar]

I had some spare time so I made the changes myself.