Rename `add_line_numbers` to `add_line_number`
Rename `add_line_numbers` to `add_line_number`

Rename the instance method of `Pry::Code::LOC`.

Signed-off-by: Kyrylo Silin <6129bf6f04030cd1423e4f3df28402e79fbf30a4@gmail.com>

raeno/pry,tdg5/pry,ngpestelos/pry,ooohiroyukiooo/pry,tdg5/pry,jasonm23/pry,85x14/pry,sferik/pry,nju520/pry,tdg5/pry,jasonm23/pry,raeno/pry,ngpestelos/pry,shockone/pry,caporta/pry,sideci-sample/sideci-sample-pry,jasnow/pry,deivid-rodriguez/pry,gfvcastro/pry,printercu/pry,pvdb/pry,scalixte-mdsol/pry,jasnow/pry,geoffreylitt/pry,85x14/pry,jasonm23/pry,gfvcastro/pry,85x14/pry,josue804/debunker,geoffreylitt/pry,icebreaker/pry,ooohiroyukiooo/pry,caporta/pry,bronzdoc/pry,josue804/debunker,shockone/pry,shockone/pry,nju520/pry,raeno/pry,scalixte-mdsol/pry,scalixte-mdsol/pry,sferik/pry,bronzdoc/pry,icebreaker/pry,ooohiroyukiooo/pry,printercu/pry,nju520/pry,pvdb/pry,jasnow/pry,richo/pry,caporta/pry