v2.3.0

Added

• Added Equals(ReadOnlySpan<char>, StringComparison) (by @Joy-less in #234)

Changed

• Improved Equals(ReadOnlySpan<char>) (by @Joy-less in #234)
• Added performance short-circuit when span is empty in Append(ReadOnlySpan<char>), AppendSpan(int), Insert(int, ReadOnlySpan<char>) in #233 (by @Joy-less)