split version detection into methods
add tests for various ffmpeg version outputs
Merge pull request #11 from beanieboi/refactor-ffprobe-version-detection

split version detection into methods
refactor ffprobe version spec
Merge pull request #12 from beanieboi/refactor-ffprobe-version-spec

refactor ffprobe version spec
add hint for ffmpeg version detection improvements
Update README.md
Update README.md
add Contributors to README
update Changes, add unreleased changes
support for detecting avprobe