v0.17.1

Changed

• Build on Vize 0.431.0, which fixes three bugs found through vize_ex:
  • Static attribute values are decoded once in Vapor templates (vize#7502). < used to become <.
  • Implicit default slot content is kept beside a named <template #name> in compile_vapor (vize#7570).
  • vapor_ir/1 keeps a static style merged with :style (vize#7600).