Fix encoding PNG file with alpha channel on macOS #59
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We do so by first convert the NSImage to CGImage, then call the WebP APIs.
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When encodes a png file with alpha channel (i.e. Export a png file with default setting from macOS's Preview.app), the library has a bug as you can see in #57.
I managed to fix this by first converting the NSImage to CGImage with RGBA, then converting CGImage to webP data.