include: Add expected.hpp

Not worth making a submodule since it's a single-file include. Originally from https://github.com/TartanLlama/expected and released under CC0 Signed-off-by: Adam C. Emerson <aemerson@redhat.com>
zalsader · May 15, 2020 · ab729f0 · ab729f0
1 parent 513f37b
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diff --git a/COPYING b/COPYING
@@ -191,4 +191,8 @@ License: BSD 3-clause
 
 Files: src/include/function2.hpp
 Copyright: 2015-2018, Denis Blank
-License: Boost Software License, Version 1.0
+License: Boost Software License, Version 1.0
+
+Files: src/include/expected.hpp
+Copyright: 2017, Simon Brand
+License: CC0