v0.4.1

FFMPEG v0.4.1

Diff since v0.4.0

Closed issues:

• julia says "ffmpeg: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory" (#37)
• FFMPEG recompilation failure (libavformat) (#41)

Merged pull requests:

• Remove confusing imports (#38) (@giordano)
• Some improvements to CI (#39) (@giordano)
• Update outdated CI to 1.5 (#40) (@IanButterworth)
• Remove x264 direct dep (#43) (@IanButterworth)