Merge pull request #900 from j-f1/set-intent-url

Intent: Set the `url` property of the Post object before returning it

MastodonIntent/Handler/SendPostIntentHandler.swift

@@ -98,6 +98,9 @@ extension SendPostIntentHandler: SendPostIntentHandling {
                     subtitle: content,
                     image: response.value.account.avatarImageURL().flatMap { INImage(url: $0) }
                 )
+                if let urlString = response.value.url, let url = URL(string: urlString) {
+                    post.url = url
+                }
                 posts.append(post)
             }   // end for in