- Set text in cell align support, note that the parameters of the `SetCellStyle` function have changed;
- go test updated

- go test updated

- Rename function `SetBorder` to `SetCellStyle`;
- Complete `xlsxColor` structure definition;
- go test updated

- Partial logic performance optimization, use pointer reference instead of a pass the variable value;
- Add comments for content types struct definition;
- Update go test `TestSetBorder` section

- Function parameter code is simplified;
- Fix element `Tint` value parsing error in worksheet;
- Update go test

- Improved performance when reading large files, call Token to read tokens one by one instead Unmarshal. Related issue #20 ;
- Fix go test typo;
- Update README

Make functions: `SetCellValue`, `SetCellInt`, `SetCellHyperLink`, `SetCellFormula`, `GetCellValue` and `GetCellFormula` to support the merged cells.

- Character limits for cells added;
- Update go test and fix typo

- Add escape characters of sheet name;
- Update go test and fix typo

- go test updated;
- fix typo and `gofmt -s` formatted

- New functions `GetActiveSheetIndex`, `GetSheetName` and `GetSheetMap` added.

- Fix `GetCellValue` causes panic in some particular situation issues;
- Go test updated

- Fix issue XML tag `headerFooter` and `sheetPr` element self-close errors cause file corruption;
- Fix issue `Section` and `Pane` element order make file corruption in some case;
- Change sheet `rId` calculation method in `/xl/workbook.xml`, fix makes file corruption in some case;
- Compatibility improved: add `xlsxTabColor` struct and some XML element for worksheet

Open file error return added and UpdateLinkedValue function added to fix linked values within a spreadsheet are not updating.

1) Update readme file credits and go report badge added; 2) Remove use less function; 3) Update test file.

- Optimisation code use fmt package
- Update README
- Remove useless function