Fix for-in issue

Signed-off-by: Fabio José <[email protected]>

Author: fabiojose

lib/bindings/http/binary_0_2.js

@@ -36,7 +36,9 @@ HTTPBinary.prototype.emit = function(cloudevent){
   // Have extensions?
   var exts = cloudevent.getExtensions(); 
   for(var ext in exts){
-    _headers["ce-" + ext] = exts[ext];
+    if({}.hasOwnProperty.call(exts, ext)){
+      _headers["ce-" + ext] = exts[ext];
+    }
   }
 
   // Return the Promise