v1.1.0

• Add support for boolean values (#13)

v1.0.1

• Fix writing unnamed worksheets with options

v1.0.0

• Don't close IO objects passed to Workbook constructor (#12)

v0.3.1

• Escape invalid XML 1.0 characters (#11)

v0.3.0

• Add support for auto-formatting (#8)

v0.2.0

• Ruby 2.4 compatibility
• Misc bug fixes

v0.1.0

• Initial release