5.2.3

• Reverted #216 until better solution, as it was never active and can't make it compile for all subspec configurations.
• Improved documentation about dynamicType: vs type(of:).
  Antondomashnev
  #221
• Fixed a race condition that occasionally prevented redirect callbacks.
  @morrowa
  #224
• Fixed response timing for zero-length stub data.
  @morrowa
  #224