Fix url_image_preview for gtk3

url_image_preview/manifest.ini

 [info]
 name: Url image preview
 short_name: url_image_preview
-version: 0.5.3
+version: 0.5.4
 description: Url image preview in chatbox.
 authors = Denis Fomin <fominde@gmail.com>
  Yann Leboulanger <asterix@lagaule.org>

url_image_preview/url_image_preview.py

@@ -45,7 +45,8 @@ class UrlImagePreviewPlugin(GajimPlugin):
             control.disconnect_from_chat_control()
         self.controls = []
 
-    def print_special_text(self, tv, special_text, other_tags, graphics=True):
+    def print_special_text(self, tv, special_text, other_tags, graphics=True,
+            additional_data):
         for control in self.controls:
             if control.chat_control.conv_textview != tv:
                 continue