is_bot does not accept DataFrames with more than one observation

[vviers]

Problem 🤕

The botfinder.bot_classifier.is_bot function takes a DataFrame but (implicitly!) assumes that the DataFrame will only contain 1 observation. This makes it impossible to use the function to predict multiple observations at the same time.

Solution 😃

Slight changes to the is_bot function will allow it to make predictions for multiple observations at the same time.
The function should return an array of objects instead of an object.