Release 0.3.0

Added

• command line parameter -d or --decor that allows to turn on and off effects [issues/18] / [pull/19]
• command line parameter -b or --bg that allows to change the target background color to white, black or transparent [pull/19]
• command line parameter -v or --verbose that shows insights on the window name and window id for the curious [pull/19]
• turn on the new shadow decor effect by default [pull/19]
  

Fixed

• white corners are now fixed and aligned with the radius of macos big sur [issues/17] / [pull/19]
• sometimes there were unexpected image dimensions, with a small stripe on the right of black pixel [pull/19]