1.21.0

Enhancements

• Add support for adding and removing on demand resources.
  JunyiXie
  Dimitris Koutsogiorgas
  #844

• Add platform_filters support for PBXBuildPhase.
  Dimitris Koutsogiorgas
  #838

• Add an unambiguous sort order to build phase files.
  Igor Makarov
  #839

• Add fallback to sort group by full path.
  Igor Makarov
  #835

Bug Fixes

• None.