Regenerate gemspec for version 1.0.6
Regenerate gemspec for version 1.0.6

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