git-multimail: update to release 1.1.0

git-multimail: update to release 1.1.0

The changes are described in CHANGES.

Contributions-by: Matthieu Moy <redacted>
Contributions-by: Richard Hansen <redacted>
Contributions-by: Michael Haggerty <redacted>
Contributions-by: Elijah Newren <redacted>
Contributions-by: Luke Mewburn <redacted>
Contributions-by: Dave Boutcher <redacted>
Contributions-by: Azat Khuzhin <redacted>
Contributions-by: Sebastian Schuberth <redacted>
Contributions-by: Mikko Johannes Koivunalho <redacted>
Contributions-by: Elijah Newren <redacted>
Contributions-by: Benoît Ryder <redacted>
Signed-off-by: Matthieu Moy <redacted>
Signed-off-by: Junio C Hamano <redacted>