Added admin mode requirement for windows symlinks

Author: XCMer

README.markdown

@@ -89,7 +89,7 @@ to verify all good, run:
 
 #### Installing spf13-vim on Windows
 
-The easiest way is to download and run the spf13-vim-windows-install.cmd file.
+The easiest way is to download and run the spf13-vim-windows-install.cmd file. Remember to run this file in **Administrator Mode** if you want the symlinks to be created successfully.
 
 ## Updating to the latest version
 The simpliest (and safest) way to update is to simply rerun the installer. It will completely and non destructively upgrade to the latest version.