add missing newline at end of file

Author: dbarker

sdk/test/common/attribute_utils_test.cc

@@ -179,4 +179,4 @@ TEST(AttributeMapTest, EqualTo)
   EXPECT_FALSE(attribute_map.EqualTo(kv_iterable_different_value));
   EXPECT_FALSE(attribute_map.EqualTo(kv_iterable_different_type));
   EXPECT_FALSE(attribute_map.EqualTo(kv_iterable_different_size));
-}
+}