Update object-filters.md

Added missing closing quote in the endDate value of the betweenDate example.

Author: Julien Cerqueira

content/article/object-filters.md

@@ -211,7 +211,7 @@ _filter = {
         },
         {
         'name': 'endDate',
-        'value': ['01/31/2015]
+        'value': ['01/31/2015']
         }
     ]