raising URIBL_BLACK score to 3.0

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1569087 13f79535-47bb-0310-9956-ffa450edef68
lowering back to 
score URIBL_BLACK 0 1.7 0 1.7
(KAM misunderstanding)


git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1569098 13f79535-47bb-0310-9956-ffa450edef68