Fix labels.exclude schema: object with name

The labels.exclude property takes an array of objects with  properties.

Author: frigus02

docs/github-settings/8. labels.md

@@ -10,9 +10,13 @@ You can use the REST API to manage labels for a repository and add or remove lab
 ```yaml
 # These settings are synced to GitHub by https://github.com/github/safe-settings
 labels:
-  - name: bug
-    color: CC0000
-    description: An issue with the system
+  include:
+    - name: bug
+      color: CC0000
+      description: An issue with the system
+  exclude:
+    # don't delete any labels that start with "release"
+    - name: ^release
 ```
 
 ## Team API Spec

schema/settings.json

@@ -75,7 +75,12 @@
           "description": "Ignore any labels matching these regexes (don't delete them)",
           "type": "array",
           "items": {
-            "type": "string"
+            "type": "object",
+            "properties": {
+              "name": {
+                "type": "string"
+              }
+            }
           }
         }
       }