add missing ":" in callback object example

ePaul · web-flow · commit 4498a8c46e3c · 2017-03-27T22:13:37.000+02:00
diff --git a/versions/3.0.md b/versions/3.0.md
@@ -1761,7 +1761,7 @@ myWebhook:
       requestBody:
         description: Callback payload
         content: 
-          'application/json'
+          'application/json':
             schema:
               $ref: '#/components/schemas/SomePayload'
       responses:
