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Guolin Ke authored and GitHub committed 8fc80bb487c
bump version (#3344) * Update VERSION.txt * Update .appveyor.yml * remove 3.0-RC installation guide * Apply suggestions from code review * [R-package] bump version (#3345) Co-authored-by: Nikita Titov <nekit94-08@mail.ru> Co-authored-by: James Lamb <jaylamb20@gmail.com>