Example:
$ gh-stats solo5 mirage mirleft
solo5, mirage and mirleft have 213 contributors (for a total of 35987 contributions).
avsm: 9635
samoht: 6660
djs55: 3616
hannesm: 2730
yomimono: 2110
pqwy: 1945
mor1: 1284
talex5: 952
dsheets: 891
rgrinberg: 847
dinosaure: 730
mato: 556
haesbaert: 519
MagnusS: 409
Drup: 347
amirmc: 293
jonludlam: 248
nojb: 233
yallop: 183
djwillia: 139
[...]
Note: this automatically excludes forks and mirrors.