Change the licensing for src/source.rs (#55)

Changes the licence to the in-file Zero-Clause BSD licence.

README.md

@@ -33,7 +33,7 @@ mdbook serve --open
 
 ## Licence
 
-All code in this repository is dual-licensed under, at your option, either:
+Except where noted, below and/or in individual files, all code in this repository is dual-licensed under, at your option, either:
 
 - MIT Licence ([LICENCE-MIT](./LICENCE-MIT) or http://opensource.org/licenses/MIT); or
 - Apache 2.0 Licence ([LICENCE-APACHE](./LICENCE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0).

stack-core/src/source.rs

@@ -1,3 +1,5 @@
+// See the file footer for the licence text.
+
 use core::{fmt, num::NonZeroUsize};
 use std::{fs, io, path::Path, sync::Arc};
 
@@ -244,3 +246,19 @@ mod test {
     Source::new("", source).line(line).map(Into::into)
   }
 }
+
+// SPDX: 0BSD
+//
+// Copyright (C) Leon Davis <[email protected]>
+// Copyright (C) Shane Vandegrift <[email protected]>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted.
+//
+// THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.