hint-tester: Don't lowercase the input

Doing this means that you can't use the hint tester for packages with
uppercase characters in the version, e.g.

  Version mismatch, dreamchess 0.2.1-rc2-2build1 != 0.2.1-RC2-2build1

britney.py

@@ -2531,7 +2531,7 @@ class Britney(object):
         while True:
             # read the command from the command line
             try:
-                user_input = input('britney> ').lower().split()
+                user_input = input('britney> ').split()
             except EOFError:
                 print("")
                 break