v0.28.15

Features

• The gitRevision option now accepts the special value {branch}, which indicates source links should use
  the current git branch for links, #3041.
• Introduced validation.invalidPath for suppressing warnings caused by referencing relative paths which
  do not exist when building the documentation, #3033.
• API: Introduced Logger.validationWarning for validation which occurs during conversion rather than
  during TypeDoc's normal validation step, #3033.