v1.10.0

• WDL spec compatibility:
  • == and != accept optional operands (#634 @jdidion)
  • fix resolution of imported struct type aliases when the original struct name is reused in current document (#635 @jdidion)
  • WDL 1.1: allow placeholder options like sep= in string expressions outside of task commands (#633 @adamnovak)
  • WDL 1.1: disable a few version development features that had been inadvertently enabled for version 1.1 (multi-line strings and optional call: keyword)
• allow extra JSON keys initializing structs (#524)
• fix bug in WDL.Env.merge() that could resurrect previously-shadowed bindings (#637 @adamnovak)
• miniwdl zip --additional to include any specified file(s) in the zip (#641 @rhpvorderman)