fix Shortcut link

Author: marcuslindh

README.md

@@ -7,6 +7,6 @@ Good code snippets from various languages
 file | Description
 --- | ---
 [EmailValidator.vb](../master/VB.net/EmailValidator.vb) | Validate email addresses
-[Shortcut.vb](../master/VB.net/Shortcut.vbb) | Create Windows Shortcuts.
+[Shortcut.vb](../master/VB.net/Shortcut.vb) | Create Windows Shortcuts.
 [ScaleImage.vb](../master/VB.net/ScaleImage.vb) | Scale images without distorting.
 [FileSize.vb](../master/VB.net/FileSize.vb) | Format file size (100KB, 1GB, 4TB)