STRUTS_2_3_21

[Alireza Fattahi]

At github I found that the STRUTS_2_3_21 is released. But I can not download it 
from maven repo, I wonder how can we get it from maven.Also at 
struts.apache.org the final release is 2.3.20, is it a normal delay from 
release to site update, or 2.3.21 is just a (somehow) middle release.
 ~Regards,
~~Alireza Fattahi