[release] version 0.4

=================== v0.4.0 ===================
- Fix: Replace slash with dashes (if video-title have slash convertion failed)
- Fix Video conversion: Use avconv by default, ffmpeg is deprecated
- Fix Video conversion: Use id-youtube (not title) by default
- Fix Installer: -a is deprecated
- New debian/ubuntu package depends: libav-tools

=================== v0.3.2 ===================
- Replace dashes with  spawn-of-satan-whitespace