Update copyright & license header to use SPDX id

This makes license detection machine-readable, and makes source files more concise and easier
to read and understand.

Signed-off-by: GitHub <noreply@github.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/travis.sh b/travis.sh
index c8b2b15..e1182ae 100755
--- a/travis.sh
+++ b/travis.sh
@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# Copyright 2007 - 2021, Alan Antonuk and the rabbitmq-c contributors.
+# SPDX-License-Identifier: mit
+
 build_cmake() {
   sudo apt install -y xmlto
   mkdir $PWD/_build && cd $PWD/_build