docs: update CHANGELOG

CHANGELOG.md

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+# Changelog
+
+## [0.2.0] - 2022-09-11
+
+Release the stable version, will rework some tasks.
+
+### Features
+
+- Improve `calm_down` option
+- Respect foldopen option while searching
+- Use FFI to build position index
+- Support `;` offset
+- Support ffi for Windows
+
+### Performance
+
+- Improve performance while moving cursor
+- Use `searchcount` to get better performance while searching
+
+## [0.1.0]
+
+- rename `HlSearchCur` to `HlSearchNear`.
+- rename `HlSearchLensCur` to `HlSearchLensNear`.
+- replace `override_line_lens` with `override_lens`.
+- add `HlSearchFloat` highlight the nearest text for the floating window.
+- add `nearest_only` option to add lens for the nearest instance and ignore others.
+- add `nearest_float_when` and `float_shadow_blend` options for displaying nearest instance lens
+- with floating window.
+- add `virt_priority` option to specify the priority of `nvim_buf_set_extmark`.
+- add `enable_incsearch` option to display the current matched instance lens while searching.
+- support `/s` and `/e` offsets for search, but don't support offset number.