README: improve language
README: improve language

potofcoffee/pinpoint,danigm/pinpoint,bpeel/pinpoint,GNOME/pinpoint,nzjrs/pinpoint,GNOME/pinpoint,tyll/pinpoint,michaelgwood/pinpoint,robclark/pinpoint,nzjrs/pinpoint,nekohayo/pinpoint,tyll/pinpoint,danigm/pinpoint,potofcoffee/pinpoint,bpeel/pinpoint,michaelgwood/pinpoint,robclark/pinpoint,nekohayo/pinpoint,robclark/pinpoint