Update revision history

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Peter Dimov
2022-09-27 20:32:03 +03:00
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@ -8,6 +8,13 @@ https://www.boost.org/LICENSE_1_0.txt
# Revision History
:idprefix:
## Changes in Boost 1.81
* The macro `BOOST_SYSTEM_DISABLE_THREADS` can now be defined to disable
the use of `<mutex>` (e.g. on single-threaded libstdc++).
* Added `value_type`, `error_type`, `in_place_value`, `in_place_error`
to `result<>`.
## Changes in Boost 1.80
* When an `error_code` is converted to `std::error_code` and then back