Add limits for unliking.

All filter settings:

from instabot import Bot
bot = Bot(
            max_likes_per_day=1000,
            max_unlikes_per_day=1000,
            max_follows_per_day=350,
            max_unfollows_per_day=350,
            max_comments_per_day=100,
            max_likes_to_like=100,
            max_followers_to_follow=2000,
            min_followers_to_follow=10,
            max_following_to_follow=10000,
            min_following_to_follow=10,
            max_followers_to_following_ratio=10,
            max_following_to_followers_ratio=2,
            min_media_count_to_follow=3,
            like_delay=10,
            unlike_delay=10,
            follow_delay=30,
            unfollow_delay=30,
            comment_delay=60,
            whitelist=False,
            blacklist=False,
            comments_file=False,
            stop_words=['shop', 'store', 'free']
)