clean up Travis config
clean up Travis config

FALCONN-LIB/FALCONN,FALCONN-LIB/FALCONN,ilyaraz/falconn_polygon,ilyaraz/falconn_polygon,FALCONN-LIB/FALCONN,ilyaraz/falconn_polygon,FALCONN-LIB/FALCONN,ilyaraz/falconn_polygon