Update bin/propolis-server/src/lib/stats/process.rs

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: iximeow

bin/propolis-server/src/lib/stats/process.rs

@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
 use std::io::Read;
 use std::time::{Duration, Instant};