Log Message:
Update to 2.2007

Upstream changes:
2.2007   2017-11-12

  [DOCUMENTATION]

  - The Moose::Manual::Attributes pod has been amended to clarify that
    'required' attributes can be satisfied with a 'default' or 'builder' sub,
    and that 'ro' attributes can be set through the constructor.

  - The Moose::Manual::Types pod has been amended to recommend
    Params::ValidationCompiler and Moops instead of older modules (which are
    slow and/or deprecated).

  - other small documentation fixes (thanks to Chris Weyl and Anirvan
    Chatterjee!)

  [OTHER]

  - some dead code has been removed (thanks, Jens Berthold!)

  - all Moose exception classes have been made immutable.