add missing licence notice to bigfloat.rs

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/src/bigfloat.rs b/src/bigfloat.rs
index 2db73a98312a0cfde21f33e09186167cd96008df..9f484e02089771e6751e8c42403990ab31b5a744 100644 (file)
--- a/src/bigfloat.rs
+++ b/src/bigfloat.rs
@@ -1,3 +1,7 @@
+// Copyright 2020 Ian Jackson
+// SPDX-License-Identifier: AGPL-3.0-or-later
+// There is NO WARRANTY.
+
 // See bigfloat.ts
 
 use crate::imports::*;