BLD/TST: correct pytz version for tox

Komnomnomnom · Komnomnomnom · commit 5c23b425eb2a · 2013-08-07T13:10:00.000+10:00
diff --git a/tox.ini b/tox.ini
@@ -11,7 +11,7 @@ deps =
     cython
     numpy >= 1.6.1
     nose
-    pytz
+    pytz >= 2011k
     six
 
 # cd to anything but the default {toxinidir} which
