soju.py 0.3.0: remove soju.im/read support

[emersion]

Script info

• Script name: soju.py
• Version: 0.3.0

Description

This IRC extension has been accepted by IRCv3 and has become draft/read-marker. The soju extension is deprecated.

Users can install read_marker.py to get the same functionality.

Checklist (script update)

• [x] Author has been contacted
• [x] Single commit, single file added
• [x] Commit message format: script_name.py X.Y: …
• [x] Script version and Changelog have been updated
• [x] For Python script: works with Python 3 (Python 2 support is optional)
• [x] Score 100 / 100 displayed by weechat-script-lint