Merge pull request #89 from adiglp/patch-1

Update g_contact_information.md with url field

asynchronous-api-guidelines/kafka-asynchronous-guidelines/g_contact_information.md

@@ -2,6 +2,8 @@
 
 AsyncAPI specs **MUST** include at least one main contact under the info.contact section.
 
+Aside from _name_ field, which describes the contact information, it supports two fields for the contact detail, _email_ and _url_. It **MUST** contain at least one of them. For _url_, it is suggested to specify an endpoint where the contact detail is clearly reflected.
+
 The spec only allows to include one contact there, but it **MAY** also include additional contacts using extension fields. In case this is done, it **MUST** use the extension field _x-additional-responsibles_.
 
 For example:
@@ -13,6 +15,7 @@ info:
   contact:
     name: "Main point of contact"
     email: "team_dl@adidas.com"
+    url: http://www.adidas.com/contact/team_dl
   x-additional-responsibles:
     - person2@adidas.com
     - person3@adidas.com