Fix Typo

fix typo from #25

Author: alorma

README.md

@@ -47,7 +47,7 @@
 * [Before deleting untracked files/directory, do a dry run to get the list of these files/directories](https://github.com/git-tips/tips#before-deleting-untracked-filesdirectory-do-a-dry-run-to-get-the-list-of-these-filesdirectories)
 * [Forcefully remove untracked files](https://github.com/git-tips/tips#forcefully-remove-untracked-files)
 * [Forcefully remove untracked directory](https://github.com/git-tips/tips#forcefully-remove-untracked-directory)
-* [Update all the submoudles](https://github.com/git-tips/tips#update-all-the-submoudles)
+* [Update all the submodules](https://github.com/git-tips/tips#update-all-the-submodules)
 
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