Add git fetch --tags to build instructions
Add git fetch --tags to build instructions

BBN-E/tac-kbp-eal,isi-nlp/tac-kbp-eal,BBN-E/tac-kbp-eal,rgabbard-bbn/kbp-2014-event-arguments,rgabbard-bbn/kbp-2014-event-arguments,isi-nlp/tac-kbp-eal