Update rna-transcription to match README

[kytrinyx]

See exercism/exercism#1310 for original discussion.

[magthe]

I'm guessing this comment belongs in this issue.

Currently rna-transcription requires more work than I expected:

• there are no instructions on how to run the exercise, I assumed I could reuse the instructions from the first exercise (leap), but
• the naming of files is important, the tests expect a module named dna, but since the tests are named rna_transcription_tests the Erlang system expects them to be a test for a module named rna_transcription, so
• the test file either has to be renamed to dna_tests.erl and its module renamed to dna_tests, or every test has to be changed to look for the function-under-test in a module called rna_transcription.

[kytrinyx]

I think it is fine to rename the expected module and the files to match the exact name of the problem. In the early days there were some really hacky reasons why this was done in this way, and it really makes no sense any more.

[magthe]

I created a pull request for this in xerlang, #27, hopefully it's good enough.

[tmcgilchrist]

Seems like this has been fixed @kytrinyx please re-open if I'm mistaken.