Add MIME-Version mail header

Author: znz

bin/commit-email.rb

@@ -319,6 +319,7 @@ def make_header(to, from, info)
     headers << x_repository(info)
     headers << x_revision(info)
     headers << x_id(info)
+    headers << 'Mime-Version: 1.0'
     headers << 'Content-Type: text/plain; charset=utf-8'
     headers << 'Content-Transfer-Encoding: quoted-printable'
     headers << "From: #{from}"