Skia Graphics Release Notes

This file includes a list of high level updates for each milestone release.

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Milestone 78

 * Added RELEASE_NOTES.txt file

 * SkDrawLooper is no longer supported in SkPaint or SkCanvas.

 * SkImageFilter API refactor started:
   - Consolidated enum types to use SkTileMode and SkColorChannel
   - Hide filter implementation classes
   - Bumps SkPicture version number

 * SkColorFilters::HSLAMatrix - new matrix color filter operating in HSLA space.