Notify about three way merge in the summary email

[kvalo]

In the summary email it would be nice to notify if git had to fall back to 3-way merge, like here:

master@wireless-drivers-next > commit 2
Retrieving patches (1/1) 
9007981 mwifiex: Drop unnecessary include pcieport_if.h
------------------------------------------------------------
1 patches
commit All/commit Individually/aBort? a
Applying: mwifiex: Drop unnecessary include pcieport_if.h
Using index info to reconstruct a base tree...
Falling back to patching base and 3-way merge...
Auto-merging drivers/net/wireless/marvell/mwifiex/pcie.h
============================================================
1 patches applied:

30cfe9f61c2e mwifiex: Drop unnecessary include pcieport_if.h

Accept/request Changes/Reject/Show mail/Edit mail/aBort?