Error in value_iteration function of DP example

[olmerg]

the code of the example of DP (chapter 3 ), do not run the part of value iteraion because in line 209 you pass the action_values but is necesary to pass V.

action_values = one_step_lookahead(environment, state, V, discount_factor)

[OnurcanKoken]

for the code of (chapter 3), frozen_lake.py, a small change:
print(''.join([action_mappings[action] for action in np.argmax(policy, axis=1)]))