Instapy does not follow the correct amount of people

```
session = InstaPy(username="Username", password="Password")
session.login()

tags = ['makeup','eyeliner']

session.follow_by_tags(tags=tags, amount=10)
```

as you can see, I set the amount to 10 but for whatever reason it follows 19.
It first follows 19 people on the hashtag 'makeup' than 19 from the hashtag 'eyeliner'