Version bump to 2.4.0
Version bump to 2.4.0

weshatheleopard/rubyXL,weshatheleopard/rubyXL,ThijsWouters/rubyXL,99cm/rubyXL,mezza/rubyXL,ryanmark/rubyXL,ThijsWouters/rubyXL,parallel588/rubyXL,parallel588/rubyXL,ryanmark/rubyXL,mezza/rubyXL,weshatheleopard/rubyXL,parallel588/rubyXL,99cm/rubyXL,ryanmark/rubyXL,mezza/rubyXL,99cm/rubyXL