acronym: Add "ROTFLSHTMDCOALM" test case from shared metadata.

[sshine]

No description provided.

[petertseng]

Yup, great.

A few things I'm going to do:

• prefix the commit message and PR title with exercise affected, so it's easy to tell at a glance from https://github.com/exercism/haskell/pulls and/or git log without extra flags
• since this follows problem-specifications version 1.4.0, change first three version components of https://github.com/exercism/haskell/blob/master/exercises/acronym/package.yaml#L2 to 1.4.0
• since tests changed, increase last version component in https://github.com/exercism/haskell/blob/master/exercises/acronym/package.yaml#L2 by 1.

these seem all trivial enough that I'd like to get this moving so we can continue with the substantive work rather than the bookkeeping

[petertseng]

Do not panic that I accidentally changed nucleotide-count's version instead of acronym; I have rectified my mistake

[sshine]

Excellent, thanks for letting me know of all the things I missed in a friendly manner. :-)

[petertseng]

I hope I haven't done so in too unfriendly of a manner previously (for example, if I was too terse and therefore seemed snippy)! If I have, I apologise.

[petertseng]

(It was equally likely that it referred to me as a maintainer of any other open source project, so I preferred to overapologise for something I didn't do rather than fail to apologise for something I did)

Thanks for this work!

[sshine]

No, you weren't unfriendly at any point. I'd just expect to be yelled at for not having read the documentation in various places that explain version bumping in this and that file. :)

[petertseng]

Oh no, it wouldn't have been fair to yell, because the kicker is that it's pretty undocumented. The only saving grace is that at least it's documented-as-undocumented in #538.