Add Nicholas Nethercote to `.mailmap`. Add Nicholas Nethercote to `.mailmap`. 517 Nicholas Nethercote <n.nethercote@gmail.com> 2 Nicholas Nethercote <nnethercote@apple.com> 560 Nicholas Nethercote <nnethercote@mozilla.com> 1079 Nicholas Nethercote <n.nethercote@gmail.com>