Adjust year in copyright comment.
-# Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+# Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
vespa_add_executable(searchsummary_attribute_combiner_test_app TEST
SOURCES
attribute_combiner_test.cpp
