Fix duplicated bots data is saved

[ngoclong19]

In this PR, I would like to add the following changes:

• Fix duplicated bots data is saved
• Update link to ASF bots listing API in README
• Add ruff, and black in requirements.txt based on recent commits, please leave a comment otherwise
• Remove folder data from version control, so changes while running scripts do not confuse the working tree.

Steps to reproduce the first issue:

• Delete data\asf_bots.json
• Execute python download_bot_listing.py
• Execute python download_bot_listing.py again
• Open data\asf_bots.json, there are duplicate Steam IDs.

According to the Python document:
https://docs.python.org/3/library/json.html#json.dumps

Keys in key/value pairs of JSON are always of the type str. When a dictionary is converted into JSON, all the keys of the dictionary are coerced to strings. As a result of this, if a dictionary is converted into JSON and then back into a dictionary, the dictionary may not equal the original one. That is, loads(dumps(x)) != x if x has non-string keys.

In download_bot_listing.py, we have this line user_id = int(user_id_as_str).
This leads to the keys of original_trade_offers and latest_trade_offers have different types, str and int respectively.

[woctezuma]

Thank you!

[woctezuma]

I just want to say that I could reproduce the issue. 👍 On Google Colab:

Installation:

%cd /content
!git clone https://github.com/woctezuma/steam-trade-finder.git
%cd /content/steam-trade-finder/
%pip install -r requirements.txt

Before the fix:

!git checkout 91552e67d395d77f044805fecaa39ca6245c6d5b
!echo "{}" > data/asf_bots.json
!python download_bot_listing.py
!python download_bot_listing.py

After the fix:

!git checkout 112b62e3964da9a81e8f73d928721999f58d590b 
%rm data/asf_bots.json
!python download_bot_listing.py
!python download_bot_listing.py

Thanks again! 🥳