Renamed CHANGELOG to CHANGELOG.md; spacing and markdown minor tweaks. / Release 2.0.0 (<- 1.0.2): Updated VERSION and CHANGELOG.

Author: ygoldfeld

CHANGELOG

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+# Version 1.0.0 (Mar 2024)
+* Initial open-source release.
+
+# Version 1.0.1 (Mar 2024)
+* Comment and/or doc changes.
+* Removed certain minor internal dead code related to macOS.
+
+# Version 1.0.2 (Mar 2024)
+* Comment and/or doc changes.
+* Style refactor (small): Encouraging `static_assert(false)` over `#error`. Encouraging `if constexpr` over SFINAE.
+
+# Version 2.0.0 (Feb 2025)
+* flow.log: Significantly improve performance of `Logger::should_log()`, invoked at ~every log call site. To enable, requires small code change when invoking `flow::log::Config::init_component_to_union_idx_mapping()`.
+* C++20 mode build and GitHub-CI-pipeline support. C++17 remains the main/minimal mode, but we now ensure user can build/use in C++20 mode also.
+* flow.perf: Minor perf improvements.
+* Dependency bump: Boost v1.84 to 1.87. Results in slight breaking API changes in flow::error.
+* Add a unit-test suite to Flow. (Flow now gains GTest dependency if built with test-suite enabled.)
+* GitHub CI pipeline: Tweak to get gcc-13 builds to work again (GitHub changed preinstalled packages).
+* Comment and/or doc changes.
+
+## API notes
+* New APIs:
+  * `flow::log::Config::init_component_to_union_idx_mapping()` new optional arg `component_payload_type_info_ptr_is_uniq = false`; set to `true` for potentially significant performance gains within Flow and flow.log log call sites in your application.
+    * Two optional preprocessor defines to further tweak perf-related internal behavior: `FLOW_LOG_CONFIG_COMPONENT_PAYLOAD_TYPE_DICT_BY_PTR`, `FLOW_LOG_CONFIG_COMPONENT_PAYLOAD_TYPE_DICT_BY_VAL`.
+* Breaking changes:
+  * A mostly, but not fully, backward-compatible improvement in the API for macro `FLOW_ERROR_EXEC_AND_THROW_ON_ERROR()`:
+    * Remove any `cref()` wrappers for args 3+ to this macro; this is no longer necessary and will likely not compile.
+    * Ideally remove now-unnecessary method `Qualifiers::` in arg 2 (function name).
+  * Removal of macro `FLOW_ERROR_EXEC_FUNC_AND_THROW_ON_ERROR()`.
+    * If you were using this, simply change it to `FLOW_ERROR_EXEC_AND_THROW_ON_ERROR` which now supports free functions.

CHANGELOG.md

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-1.0.2
+2.0.0