issues number for 9.20
issues number for 9.20

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