SwiftXLSX v0.1.4

Add support inserting images into cells.
Fix bug creating empty document.

SwiftXLSX v0.1.3

Update macOS support

SwiftXLSX v0.1.2

• auto create index of cells when he add to sheet
• no need necessary to use method buildindex() for XSheet instance. (only if has been changed coord of cell already added to sheet)
• change to public test() of class XWorkBook

SwiftXLSX v0.1.0

Excel spreadsheet (XLSX) format writer on pure SWIFT.
SwiftXLSX is a library focused creating Excel spreadsheet (XLSX) files directly on mobile devices.