Regenerate gemspec for version 1.2.0
Regenerate gemspec for version 1.2.0

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