Checking in changes prior to tagging of version 0.21.

Changelog diff is:

diff --git a/Changes b/Changes
index a904522..0f00c8d 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Apache::LogFormat::Compiler

 {{$NEXT}}

+0.21 2014-01-07T13:43:29Z
+
+   - requires perl v5.8.4 (Thank you dex4er)
+   - skip tz test on Cygwin.
+
 0.20 2014-01-07T00:38:29Z

    - Fixed test. Cygwin does not die tzset. But timezone does not been changed