v0.1.3

Added

• #94: Window::inner_size allows setting a dynamic that will be
  synchronized with the window's inner size. When the dynamic is set to a new
  value, a resize request will be sent to the operating system. When the
  window's size is changed by the operating system, this dynamic will be updated
  with the new value.

  This dynamic is also accessible through RunningWindow::inner_size, which is
  accessible through contexts passed into various Widget functions.

• Progress now implements Default by returning Progress::Indeterminant.

Fixed

• #97: Dynamic callback invocations could be missed for a value when
  multiple threads were updating values at the same time. Now it is
  guaranteed that each callback will observe the latest value at least once.

  Cycles on the same thread are still detected and logged to prevent infinite
  loops from callback chain cycles.

• An integer underflow has been fixed in the Grid/Stack widgets.

• Padding is now rounded to the nearest whole pixel when applied across widgets.