Log Message:
Update to 2.141520. From the changelog:

- Clarified use of 'file' for the 'provides' field in the Spec
- Added ability for CPAN::Meta::Converter to convert metadata fragments
  (incomplete portions of a metadata structure)
- Optimized internal use of JSON for datastructure cloning
- Removed dependency on List::Util 1.33
- Clarified language around 'dynamic_config' in the Spec
- A change to the default meta-spec URL in 2.140630 from search.cpan.org
  to metacpan.org broke Module::Build and ExtUtils::MakeMaker.  This
  reverts that change.  Also added the missing change note to the prior
  version.
- Default meta-spec URL points to metacpan.org instead of search.cpan.org
- Added a 'load_string' method that guesses whether the string
  is YAML or JSON