Ignore two lines of github3.legacy
Ignore two lines of github3.legacy

It seems that even though the field is described in the API docs, it is never
used in practice, so ignore it.

itsmemattchung/github3.py,ueg1990/github3.py,krxsky/github3.py,jim-minter/github3.py,sigmavirus24/github3.py,h4ck3rm1k3/github3.py,degustaf/github3.py,wbrefvem/github3.py,christophelec/github3.py,icio/github3.py,agamdua/github3.py,balloob/github3.py