src download link for struts 2.1.8.1 incorrect

[Brice Roncace]

Just an FYI: the link to the struts 2.1.8.1 source zip file points to the
struts 2.1.8 source,
http://apache.inetbridge.net/struts/source/struts-2.1.8-src.zip (it should
be http://apache.inetbridge.net/struts/source/struts-2.1.8.1-src.zip).

Brice