updated readme
updated readme

spqr33/easyloggingpp,dreal-deps/easyloggingpp,utiasASRL/easyloggingpp,spqr33/easyloggingpp,dreal-deps/easyloggingpp,utiasASRL/easyloggingpp,simonhang/easyloggingpp,chenmusun/easyloggingpp,spthaolt/easyloggingpp,chenmusun/easyloggingpp,blankme/easyloggingpp,spthaolt/easyloggingpp,chenmusun/easyloggingpp,blankme/easyloggingpp,hellowshinobu/easyloggingpp,arvidsson/easyloggingpp,spthaolt/easyloggingpp,blankme/easyloggingpp,dreal-deps/easyloggingpp,utiasASRL/easyloggingpp,arvidsson/easyloggingpp,lisong521/easyloggingpp,arvidsson/easyloggingpp,hellowshinobu/easyloggingpp,spqr33/easyloggingpp,lisong521/easyloggingpp,simonhang/easyloggingpp,hellowshinobu/easyloggingpp,lisong521/easyloggingpp,simonhang/easyloggingpp