Throw error if any pixel value is not a number #53
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And offer suggestion to pass in ImageData object's data property, not an ImageData object itself
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fix #52
Just added a conditional check to make sure pixel values are numbers -- if not, it throws an error with a suggestion to make sure to pass in ImageData.data and not an ImageData object itself. (Seems like an easy mistake to make for someone new to the Canvas API and new to this library.)