4-space indentation fix

@@ -44,12 +44,12 @@ class S3EventSource(kappa.event_source.base.EventSource):
 
         # Add S3 key filters
         if 'key_filters' in self._config:
-          filters_spec = { 'Key' : { 'FilterRules' : [] } }
-          for filter in self._config['key_filters']:
-            if 'type' in filter and 'value' in filter and filter['type'] in ('prefix', 'suffix'):
-              rule = { 'Name' : filter['type'], 'Value' : filter['value'] }
-              filters_spec['Key']['FilterRules'].append(rule)
-          notification_spec['LambdaFunctionConfigurations'][0]['Filter'] = filters_spec
+            filters_spec = { 'Key' : { 'FilterRules' : [] } }
+            for filter in self._config['key_filters']:
+                if 'type' in filter and 'value' in filter and filter['type'] in ('prefix', 'suffix'):
+                    rule = { 'Name' : filter['type'], 'Value' : filter['value'] }
+                    filters_spec['Key']['FilterRules'].append(rule)
+            notification_spec['LambdaFunctionConfigurations'][0]['Filter'] = filters_spec
 
         try:
             response = self._s3.call(