1.5.1

Enhancements

• None.

Bug Fixes

• Always lower case spec repo URL for 'SPEC REPOS'
  Dimitris Koutsogiorgas
  CocoaPods#7586

• Calling Specification#dup will set the parent for subspecs to be
  the new object.
  Samuel Giddins

• Podfile objects are equatable.
  Samuel Giddins

• Stably sort arrays being serialized into YAML.
  Samuel Giddins