bumping version to 0.8.7
bumping version to 0.8.7

akhilman/cement,rjdp/cement,fxstein/cement,datafolklabs/cement,rjdp/cement,akhilman/cement,datafolklabs/cement,akhilman/cement,datafolklabs/cement,fxstein/cement,fxstein/cement,rjdp/cement