Version 2.3.6

Light scheme: made background slightly lighter, changed font color to dark gray.
Version 2.4

Changed many highlight groups concerning UI to monochrome and added CursorLineNr.
Version 2.4.1: Light scheme: corrected colors of selections and folds.
Version 2.4.2

Changed color of LineNr, NonText, CursorLineNr, FoldColumn, and SignColumn to make it more distinguishable from Normal.