cassandra 1.2.11
cassandra 1.2.11

Formerly pointing at 1.2.10, most mirrors no longer have this version.
In addition, the mirrors that did have it had a sha1 that differed.

Signed-off-by: Adam Vandenberg <34c2b6407fd5a10249a15d699d40f9ed1782e98c@gmail.com>

DomT4/homebrew-versions,UniqMartin/homebrew-versions,heuermh/homebrew-versions,jimhe/homebrew-versions,coeligena/homebrew-verscustomized,Ashton-W/homebrew-versions