Adjust default colors (#14)

Author: marcelwgn

docs/Alternating-dark-theme.png

@@ -15,7 +15,7 @@ internal static class DefaultRainbowIndentOptions
     {
         public const int defaultIndentSize = 4;
         public const string defaultFileExtensionsIndentSizes = "";
-        public const string defaultColors = "#40FFFF00,#4066FF33,#4000CCFF,#409933FF,#40FF00FF,#40FF0000,#40FFAA00";
+        public const string defaultColors = "#30e8e800,#3054cf2b,#30009fc7,#307a2ac9,#30db00db,#30cf0000,#30db9200";
         public const double defaultOpacityMultiplier = 1.0;
         public const HighlightingMode defaultHighlightingMode = HighlightingMode.Alternating;