Add license blurb to ioq_opener
diff --git a/src/ioq_opener.erl b/src/ioq_opener.erl
index 5bcf065..ebefc73 100644
--- a/src/ioq_opener.erl
+++ b/src/ioq_opener.erl
@@ -1,3 +1,15 @@
+% 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
+% 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.