README.md in trackler-2.2.1.101

- old
+ new

@@ -36,9 +36,9 @@
 You can also add the `-v` flag e.g. `prove . --exec=perl6 -v` to display all
 tests, including any optional tests marked as 'TODO'.
 
 ## 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.