automerge shouldn't let GH wrap the first line of the commit message

[benjaminp]

python/cpython@ee78ba2 ended up with ugly GH line-wrapping of the first line despite the PR python/cpython#2825 title being unwrapped.

[Mariatta]

GitMate.io thinks possibly related issues are python/core-workflow#27 (Merge commit messages), #38 (Remove [X.Y] from the backport commit message), python/devguide#199 (Improve "Commit Messages" section in committing.rst), #53 (Strip backport PR number from the commit message), and python/devguide#125 (Add core-dev guidance on squash merge commit messages).

[Mariatta]

The line-wrapping is done by GitHub Web UI, not a bug on our side.

The git data does not break the commit message.

$ git log ee78ba2c819b0cd7671a575e584d8fe1b7adb3e4
commit ee78ba2c819b0cd7671a575e584d8fe1b7adb3e4
Author: Shoham Peller <shoham.peller@stratoscale.com>
Date:   Sat Sep 15 02:28:08 2018 +0300

    [2.7] closes bpo-8450: a better error message when http status line isn't received (GH-2825)
    
    
    
    When the server has closed the connection before sending a status-line,
    the client's error message should have a more descriptive error message
    
    https://bugs.python.org/issue8450