Version 0.4.0

This release includes several improvements and fixes to long-standing issues. We strongly recommend to upgrade.

Changes to the API:

• The default value for ffmpeg_timeout is now zero, e.g. just wait for ffmpeg.
• Added bits_per_pixel parameter to read_frames.

Fixes:

• Improved handling of interrupts during reading/writing/closing-down.
• Fixed that keyboard interrups would propagate to ffmpeg.
• Fixed that ffmpeg would sometimes hang after reading.
• Fixed the occurance of segfaults under certain conditions.
• Stopped executable window from flashing on Windows.

Other improvements:

• Support for Cygwin.
• Official support for Python 3.8.
• Support for pathlib.Path filenames.