v1.3.0 - Switch to FFmpeg main package

What's Changed

• [dependencies] Upgrade ffmpeg_kit_flutter_min_gpl to stable version by @adigladi in #81
• Improvement of documentation in readme & comments + fix bad naming by @LeGoffMael in #84

New Contributors

• @adigladi made their first contribution in #81

Full Changelog: v1.2.5...v1.3.0