Update .mailmap

Change-Id: I9bd776e3d1ae120d56d6ee2f8eec9a5d80aa38cc
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

.mailmap

@@ -7,3 +7,4 @@ Saša Živkov <sasa.zivkov@sap.com>            Sasa Zivkov <zivkov@gmail.com>
 Shawn Pearce <spearce@spearce.org>           Shawn O. Pearce <sop@google.com>
 Shawn Pearce <spearce@spearce.org>           Shawn Pearce <sop@google.com>
 Shawn Pearce <spearce@spearce.org>           Shawn O. Pearce <spearce@spearce.org>
+Terry Parker <tparker@google.com>            tparker <tparker@google.com>