Support get cell value which contains a date in the ISO 8601 format

- Support set and get font color with indexed color
- New export variable `IndexedColorMapping`
- Fix getting incorrect page margin settings when the margin is 0
- Update unit tests and comments typo fixes
- ref #65, new formula functions: AGGREGATE and SUBTOTAL

1 files changed, 1 insertions, 1 deletions

diff --git a/file.go b/file.go
index 7ce536c..43a37dd 100644
--- a/file.go
+++ b/file.go
@@ -176,7 +176,7 @@ func (f *File) writeToZip(zw *zip.Writer) error {
 	f.workBookWriter()
 	f.workSheetWriter()
 	f.relsWriter()
-	f.sharedStringsLoader()
+	_ = f.sharedStringsLoader()
 	f.sharedStringsWriter()
 	f.styleSheetWriter()