Log Message:
Update to 1.300031

Upstream changes:
1.300031  2017-04-04 14:35:42-04:00 America/New_York
        - EMAIL_SENDER_TRANSPORT did not properly handle the =-prefix case
          Now: =Foo::Bar expands to Foo::Bar, Foo::Bar expands to Foo::Bar,
          and FooBar expands to Email::Sender::Transport::FooBar, as intended.

          Previously, =Foo::Bar expanded to Email::Sender::Transport::Foo::Bar