0.2.0

Change

• ActionStorage (#99)
• reorder bandit __init__ parameters and change some default values (#102)
• default n_actions in BaseBandit.get_action is chaged to None (#103)
• BaseBandit.get_action add support for n_actions=None and n_actions=-1 (#103)

Fix

• remove the generators in Exp3 and UCB1 (#101)