.mailmap: update with my new email

Signed-off-by: Bjorn Neergaard <bjorn.neergaard@docker.com>

.mailmap

@@ -103,6 +103,9 @@ Bily Zhang <xcoder@tenxcloud.com>
 Bin Liu <liubin0329@gmail.com>
 Bin Liu <liubin0329@gmail.com> <liubin0329@users.noreply.github.com>
 Bingshen Wang <bingshen.wbs@alibaba-inc.com>
+Bjorn Neergaard <bjorn@neersighted.com>
+Bjorn Neergaard <bjorn@neersighted.com> <bjorn.neergaard@docker.com>
+Bjorn Neergaard <bjorn@neersighted.com> <bneergaard@mirantis.com>
 Boaz Shuster <ripcurld.github@gmail.com>
 Bojun Zhu <bojun.zhu@foxmail.com>
 Boqin Qin <bobbqqin@gmail.com>