rna-transcription: provide more accurate source info
Original source seemed to mention a simple replacement of T with U
rather than the transcription being performed.
@@ -52,7 +52,7 @@ If you want to know more about Exercism, take a look at the [contribution guide]
## Source
-Rosalind [http://rosalind.info/problems/rna](http://rosalind.info/problems/rna)
+Hyperphysics [http://hyperphysics.phy-astr.gsu.edu/hbase/Organic/transcription.html](http://hyperphysics.phy-astr.gsu.edu/hbase/Organic/transcription.html)
## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
