Add missing license headers.

PiperOrigin-RevId: 444259197
Change-Id: I687248c8750fe3da6dfe9b82cf1a1551bb78726c

open_spiel/python/algorithms/boltzmann_tabular_qlearner_test.py

@@ -1,3 +1,16 @@
+# Copyright 2022 DeepMind Technologies Limited
+#
+# 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
+#
+#      http://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.
 """Tests for open_spiel.python.algorithms.boltzmann_tabular_qlearner."""
 
 from __future__ import absolute_import

open_spiel/python/algorithms/tabular_qlearner_test.py

@@ -1,3 +1,16 @@
+# Copyright 2022 DeepMind Technologies Limited
+#
+# 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
+#
+#      http://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.
 """Tests for open_spiel.python.algorithms.tabular_qlearner."""
 
 from __future__ import absolute_import