mailmap: Give priority to Kevin Mahell's GitHub email.
mailmap: Give priority to Kevin Mahell's GitHub email.

Email fetched from the public commit at
kevinmehall/rust-vcd/commit/06d133e7471943640d0768738f75032df2c1f4f6.patch

brainwane/zulip,rht/zulip,showell/zulip,showell/zulip,kou/zulip,kou/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,kou/zulip,hackerkid/zulip,showell/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,punchagan/zulip,zulip/zulip,punchagan/zulip,zulip/zulip,punchagan/zulip,andersk/zulip,hackerkid/zulip,zulip/zulip,showell/zulip,kou/zulip,hackerkid/zulip,zulip/zulip,andersk/zulip,brainwane/zulip,brainwane/zulip,brainwane/zulip,eeshangarg/zulip,andersk/zulip,rht/zulip,punchagan/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,kou/zulip,rht/zulip,rht/zulip,punchagan/zulip,showell/zulip,punchagan/zulip,andersk/zulip,andersk/zulip,showell/zulip,showell/zulip,hackerkid/zulip,brainwane/zulip,eeshangarg/zulip,hackerkid/zulip,hackerkid/zulip,punchagan/zulip,hackerkid/zulip,rht/zulip,brainwane/zulip,zulip/zulip,andersk/zulip,brainwane/zulip,rht/zulip