chore: add --top option and bump to v0.2.0

[mloncarevich]

Summary

New feature

• Add --top N / -t N option to show only top N contributors
• Useful for repos with many contributors

Version bump

• Bump version from 0.1.0 → 0.2.0
• Reflects all the new features added

Usage

# Show only top 5 contributors
gitstats stats --top 5

# Combine with other filters
gitstats stats --top 3 --since 2025-01-01

Example output

👥 Commits by Author (top 5 of 23)
┏━━━━━━━━━━━━━━━━┳━━━━━━━━━┳━━━━━━━━━━━━┓
┃ Author         ┃ Commits ┃ Percentage ┃
┡━━━━━━━━━━━━━━━━╇━━━━━━━━━╇━━━━━━━━━━━━┩
│ Milan          │      42 │     35.0%  │
│ ...            │     ... │       ...  │
└────────────────┴─────────┴────────────┘

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