Separate additional copyright (#1232)

Author: dansanduleac

gradle-baseline-java/src/main/groovy/com/palantir/baseline/plugins/MultiLicenseHeaderStep.java

@@ -12,7 +12,9 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- *
+ */
+
+/*
  * Original copyright:
  *
  * Copyright 2016 DiffPlug