Release v0.4.0

What's Changed

• feat: add --copy flag to copy output to system clipboard by @matiasvillaverde in #7
• perf: implement comprehensive performance optimizations by @matiasvillaverde in #10
• feat: implement custom priority support for file prioritization (fixes #9) by @matiasvillaverde in #11

Full Changelog: v0.3.0...v0.4.0