Mention cargo-diet and sort in README

[cruessler]

This PR mentions 2 issues I encountered when I ran just test check-size for the first time.

• I did not have cargo-diet installed, so I thought it might be a good idea to mention it.

• I did not have LC_ALL set in my environment which made one of the tests fail with the following diff:

  < ./a-non-bare-repo-with-extension.git/.git
  4a4
  > ./a-non-bare-repo-with-extension.git/.git
  8d7
  < ./no-origin/.git
  9a9
  > ./no-origin/.git
  11d10
  < ./origin-and-fork/.git
  12a12
  > ./origin-and-fork/.git
  14,15c14,15
  < ./special-origin/.git
  < ./special-origin/a
  \ No newline at end of file
  ---
  > ./special-origin/a
  > ./special-origin/.git
  \ No newline at end of file
  

  Notice that dotfiles and non-dotfiles were sorted in a way that did not match the snapshot. One could also individually set LC_ALL=C for all or just the failing invocations of sort in shell scripts.

[Byron]

Thanks a lot for the fly-by fixes!

Now that I see it, I think even though cargo diet can be mentioned, the part that says running should just be just test, check-size I haven't run myself in a long time, it's very occasional only.

With LC_ALL, I think it would be better to at least put it into the top-level journey test, I wasn't aware that the sort-order is dependent on the locale.

Does that make sense?

[cruessler]

That makes a lot of sense! I’ve updated the PR accordingly.

[Byron]

Perfect, thanks a lot :)!