Version bump to 2.5.4
Version bump to 2.5.4

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