Add support for arbitrary filter functions

[Techwolfy]

Description

Adds support for arbitrary filter functions, allowing fine-grained control of predictions.

Type of change

• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

I've been using a function similar to the below to make predictions for a few weeks, it worked perfectly.

def testFilter(outcomes, title):
    if "Will the streamer be victorious?" not in title:
        return None

    if outcomes[0][OutcomeKeys.ODDS_PERCENTAGE] < 35:
        return "A"
    else: #outcomes[1][OutcomeKeys.ODDS_PERCENTAGE] < 65:
        return "B"

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [ ] I have commented on my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation (README.md)
• [x] My changes generate no new warnings
• [x] Any dependent changes have been updated in requirements.txt

[Tkd-Alex]

Can you please update the README or provide a valid example where explain how the use should use this filter?

[Techwolfy]

An example filter function is in the description above; it can be used to only interact with specific predictions where the real odds are known, and to always bet on the side in favor of the user.

[taurynamonsterxdd]

help me pls on heroku