Merge pull request #29 from natemccurdy/docs/ghe

Update the README with info about GitHub Enterprise

README.md

@@ -82,6 +82,12 @@ Both http & https URLs are acceptable.
 server_url   => 'http://my.internal.gms.server.example.com',
 ```
 
+If using GitHub Enterprise, add `/api/v3` to the URL, and you'll probably need to use https:
+
+```puppet
+server_url   => 'https://my.internal.gms.server.example.com/api/v3',
+```
+
 #### provider
 
 The Git Management System you are currently using in reference to the webhook you are managing.  Currently only GitHub and GitLab are supported.
@@ -109,6 +115,12 @@ name         => 'One of my unique deploy keys',
 
 GitHub and GitLab utilize a token based authentication system to access their APIs respectively
 
+The API token generated must have admin permissions and the ability to read/write keys. If the permissions are wrong, you'll likely see the following error message:
+
+```
+...can't convert String into Integer...
+```
+
 #### token
 This is the unique token you created within your GMS to allow you to interface with the system via the API.