docs: add CHANGELOG notes for 0.21.0

CHANGELOG.md

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+# Changelog
+
+## [0.21.0] — 2024-02-21
+
+### Breaking
+
+- Remove the apply-all-captures flag, make last-wins precedence the default for queries
+
+  **NOTE**: This change might cause breakage in your grammar's highlight tests. Just
+  flip the order around of the relevant queries, and keep in mind that the last
+  query that matches will win.
+
+### Bug Fixes
+
+- Prettify xml output and add node position info
+- Inherited grammar generation
+- Properly error out when the word property is an invalid rule
+- Update schema for regex flags
+- Properly handle `Query.matches` when filtering out results
+- Sexp format edge case with quoted closed parenthesis
+- Always push the default files if there's no `externals`
+- Don't log NUL characters
+- Don't throw an error if the user uses `map` in the grammar
+- Remove redundant imports
+- **cli**: Installation via a HTTP tunnel proxy
+- **cli**: Don't update tests automatically if parse errors are detected
+- **cli**: Don't use `long` for `grammar_path`
+- **test**: Allow writing updates to tests without erroneous nodes instead of denying
+  all of them if a single error is found
+- **test**: Edge case when parsing `UNEXPECTED`/`MISSING` nodes with an indentation
+  level greater than 0
+- **wasm**: Remove C++ mangled symbols
+
+### Build System
+
+- Add useful development targets to makefile
+- Add editorconfig
+- Remove symbolic links from repository
+- Move common Cargo.toml keys into the workspace and inherit them
+- Enable creating changelogs with git-cliff
+- **deps**: Bump clap from 4.4.18 to 4.5.0
+- **deps**: Bump wasmtime from v16.0.0 to v17.0.1
+- **deps**: Bump wasmtime to v18.0.1
+
+### Documentation
+
+- Create issue template
+- Document regex limitations
+- Mention that `token($.foo)` is illegal
+- Explicitly mention behavior of walking outside the given "root" node for a `TSTreeCursor`
+- Small fixes
+- Add `Tact` language parser
+- **web**: Provide deno usage information
+
+### Features
+
+- Use lockfiles to dedup recompilation
+- Improve error message for files with an unknown grammar path
+- Implement first-line-regex
+- Error out if an empty string is in the `extras` array
+- Allow specifying an external scanner's files
+- Better error info when a scanner is missing required symbols
+- **cli**: Add an optional `grammar-path` argument for the playground
+- **cli**: Add optional `config-path` argument
+- **loader**: Add more commonly used default parser directories
+
+### Miscellaneous Tasks
+
+- Document preferred language for scanner
+- Add java and tsx to corpus tests
+- Provide a CLI flag to open `log.html`
+- Some more clippy lints
+- Remove deprecated query parsing mechanism
+- Print out full compiler arguments ran when it fails
+- Deprecate C++ scanners
+- Update relevant rust tests
+- Clippy lints
+- Error out when multiple arguments are passed to `token`/`token.immediate`
+- Update `Cargo.lock`
+- Get rid of `github_issue_test` file
+- **cli**: Use spawn to display `emcc`'s stdout and stderr
+- **cli**: Warn users when a query path needed for a subcommand isn't specified
+  in a grammar's package.json
+- **generate**: Dedup and warn about duplicate or invalid rules
+- **test**: Use different languages for async tests
+- **wasm**: Use `SIDE_MODULE=2` to silence warning
+
+### Refactor
+
+- Extract regex check into a function and lower its precedence
+- `&PathBuf` -> `&Path`
+- Name anonymous types in api.h
+
+### Testing
+
+- Add quotes around bash variables
+- Update html tests