- Make function `TitleToNumber()` exportable, note that function `ToAlphaString()` return value calculation changes, get more info from go doc. Relate issue #63;

- Readme and go doc updated

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 2ab87e1..2cefd0c 100644
--- a/README.md
+++ b/README.md
@@ -148,7 +148,7 @@ func main() {
         os.Exit(1)
     }
     // Insert a picture.
-    err = xlsx.AddPicture("Sheet1", "A2", "./image1.gif", "")
+    err = xlsx.AddPicture("Sheet1", "A2", "./image1.png", "")
     if err != nil {
         fmt.Println(err)
     }