Add missing copyrights

pekkaklarck · pekkaklarck · commit 210a3e3dd89d · 2020-10-14T21:53:31.000+03:00
diff --git a/src/robot/libdocpkg/htmlutils.py b/src/robot/libdocpkg/htmlutils.py
@@ -1,3 +1,18 @@
+#  Copyright 2008-2015 Nokia Networks
+#  Copyright 2016-     Robot Framework Foundation
+#
+#  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.
+
 import re
 try:
     from urllib import quote
