Align license header with README.md

src/tiv.cpp

@@ -14,8 +14,20 @@
  *     You should have received a copy of the GNU General Public License
  *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
- * This file used to be licensed under the Apache license. Older version
- * under this license are available via the git history of this repository.
+ * Alternatively, you may copy, redistribute and/or modify this file under
+ * the terms of the Apache License, version 2.0:
+ *
+ *     Licensed under the Apache License, Version 2.0 (the "License");
+ *     you may not use this file except in compliance with the License.
+ *     You may obtain a copy of the License at
+ *
+ *         https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     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.
  */
 
 #include <array>