Fix indentation mismatch

Author: mecampbellsoup

lib/active_model_serializers/adapter/json_api/pagination_links.rb

@@ -15,7 +15,7 @@ def initialize(collection, adapter_options)
  JsonApi::PaginationLinks requires a ActiveModelSerializers::SerializationContext.
  Please pass a ':serialization_context' option or
  override CollectionSerializer#paginated? to return 'false'.
-             EOF
+            EOF
           end
         end