Update to 1.4

Upstream changes:
2017-04-07 Mattias Holmlund

  Version 1.4

    Fix tests when run without internet connectivity. Patch by Mike Parker.
    Fixes https://rt.cpan.org/Ticket/Display.html?id=120584

2017-03-11 Mattias Holmlund

  Version 1.3

    Added missing Changes entry for version 1.2. No other changes.

2017-03-07 Mattias Holmlund

  Version 1.2

    Add X-No-Server-Contact header when the content returned has been
      delivered without any contact with the external server

(wen)