Fixed isodate formatting.

JNRowe · JNRowe · commit 7d1c855d2f44 · 2011-05-29T16:37:59.000+01:00
This is why tests are good ;)
diff --git a/github2/core.py b/github2/core.py
@@ -88,7 +88,7 @@ def datetime_to_isodate(datetime_):
 
     :param str datetime_: datetime object to convert
     """
-    return "%s%z" % datetime_.isoformat()
+    return "%sZ" % datetime_.isoformat()
 
 
 class GithubCommand(object):
