v2.1.1

Important Change

• Axes.replace now does not change axes in-place.
  Instead of img.axes.replace("t", "z"), you'll have to do img.axes = img.axes.replace("t", "z").

New Features

• Add plugin argument in imshow for visualization with different backends.
• New mask option in gaussfit.
• Implemented array covariates. The labels attribute of LabeledArray is now one of the covariates.
• Initial support of ImageJ-like ROI object as an array covariate. Accordingly, implement ip.roiread function.
• New chapter "Gallery" in documentation.
• Add random generator and its API ip.random.default_rng.

Bug Fixes

• Scale unit was wrong when reading a MRC image.
• Some filters didn't work for binary images.
• Try/except in reading OME-TIFF.