fixed typo (daattali#524)

README.md

@@ -118,7 +118,7 @@ To use Facebook comments, create a Facebook app using [Facebook developers](http
 
 To use Staticman, you first need to invite `staticmanlab` as a collaborator to your repository (by going to your repository **Settings** page, navigate to the **Collaborators** tab, and add the username `staticmanlab`), and then accept the invitation by going to `https://staticman3.herokuapp.com/v3/connect/github/<username>/<repo-name>`. Lastly, fill in the `staticman` parameters in the Staticman section of `_config.yml`. You may also choose a different Staticman instance other than `staticmanlab`.
 
-Optional: You may want to configure a webhook to prevent old inactive branches (representing approved comments) from stacking up.  You can refer to [Staticman's documenation](https://staticman.net/docs/webhooks) for details.  Make sure to input the **Payload URL** according to your chosen `endpoint`.  For example, the default `endpoint` is `https://staticman3.herokuapp.com/v3/entry/github/`, so the corresponding **Payload URL** should be `https://staticman3.herokuapp.com/v1/webhook`.
+Optional: You may want to configure a webhook to prevent old inactive branches (representing approved comments) from stacking up.  You can refer to [Staticman's documentation](https://staticman.net/docs/webhooks) for details.  Make sure to input the **Payload URL** according to your chosen `endpoint`.  For example, the default `endpoint` is `https://staticman3.herokuapp.com/v3/entry/github/`, so the corresponding **Payload URL** should be `https://staticman3.herokuapp.com/v1/webhook`.
 
 #### JustComments