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fix unprediction of cog files #114

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daguirreg
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Hi, thank you for this library that is being very useful to me but while using it, I found the following bug:

COG files that were compressed with prediction level 2 are being unpredicted incorrectly. The problem is that the decoder is being applied on the wrong axis.

Please find attached some images that show the problem:
This is the obtained image when applying the decoder on axis=1
unprediction_error

Obtained image applying the decoder on axis=2
correct_prediction

Also, take a look to the test called "test_cog_read_with_prediction_level_2" which validates the obtained image using rasterio.

@geospatial-jeff
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@daguirreg This looks great, thanks for the PR! Would you mind running black against the code so CI passes?

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