Log Message:
Updated p5-HTTP-Message to 6.13.

6.13      2017-06-20 01:07:03Z
    - Non-TRIAL release of changes found in 6.12

6.12      2017-06-15 18:03:50Z (TRIAL RELEASE)
    - If an object is passed to HTTP::Request, it must provide a canonical()
      method (Olaf Alders)
    - Make sure status messages don't die by checking the status exists before
      checking the value range (Kent Fredric, GH #39)
    - Add a .mailmap file to clean up the contributors list
    - Avoid inconsistent setting of content to undef (Jerome Eteve)
    - Simplify the way some methods are created (Tom Hukins)
    - Remove some indirect object notation (Chase Whitener)
    - Fix example in Pod (Tobias Leich)
    - Add support for HTTP PATCH method (Mickey Nasriachi)