[rosalind] fix spelling

Author: L. Grondin

rosalind/README

@@ -7,7 +7,7 @@ Project Euler inspired platform for teaching bioinformatics).
 
 *** SPOILER WARNING ***
 If you intend to learn bioinformatics with rosalind, you'll have
-to resist the tentation of reading the solutions in this directory.
+to resist the temptation of reading the solutions in this directory.
 *** YOU'VE BEEN WARNED ***
 
 Use the file format <id>-<author>.pl replacing <id> with the (lowercase)