v0.4.17

POMDPModels v0.4.17

Diff since v0.4.16

Closed issues:

• Upgrade POMDPModels to use POMDPTools (#85)
• Can't import POMDPTools.mean_reward (#88)

Merged pull requests:

• ci workflow update, readme update, files cleanup (#87) (@dylan-asmar)
• restore MiniHallway mean_reward functionality (#89) (@WhiffleFish)
• remove deprecated functions (#90) (@WhiffleFish)
• reversed tiger state and observation order so that it matches stateindex (#91) (@zsunberg)