V0.7.0: Fixed critical bugs and added latest chapter download capability

• Added (-l / --latest) positional argument for downloading only the latest released chapter.
• Fixed Inconsistent naming of some chapters which was due to some unkown jumps in chapter numbering.

Consistent Numbering ✔️	Inconsistent Numbering ❌

• Fixed the Innability to download series belonging to the Challenge category which uses a different html layout compared to other series.

Challenge Category Webtoons	Regular Webtoons