Log Message:
Update to 0.21
--------------
0.21 2014-06-25
    - Fixed typos in pod. RT#95017 - thanks Daniel Lintott.
    - Added links to a number of modules in SEE ALSO.
    - Added links to wikipedia page on assert.h
    - Added github repo to dist metadata and pod
    - Add "use warnings" and bumped min perl version to 5.6.0
    - Added license type to dist metadata via Makefile.PL
    - Add TEST_REQUIRES if your EU::MM supports it, otherwise
      add them to PREREQ_PM
    - Reformatted Changes as per CPAN::Changes::Spec