v0.3 Release

Fixed some errors for mkv:

• fixed wrong duration for mkv
• fixed wrong type for -d argument
• fixed range for -n
• fixed error on exit

v0.2 Release

• one file fix
• random vfilter and afilter for multiple instances
• better documentation
• better video duration handling
• Added ffprobe
• minor fixes

First release 0.1

First release.