Add Apache-2.0 notice to IcoImagePlugin (#8947)

Author: radarhere

src/PIL/IcoImagePlugin.py

@@ -17,6 +17,20 @@
 # <casadebender@gmail.com>.
 # https://code.google.com/archive/p/casadebender/wikis/Win32IconImagePlugin.wiki
 #
+# Copyright 2008 Bryan Davis
+#
+# 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.
+
 # Icon format references:
 #   * https://en.wikipedia.org/wiki/ICO_(file_format)
 #   * https://msdn.microsoft.com/en-us/library/ms997538.aspx