CHANGELOG.md: initial (#19)

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file, in reverse chronological order by release.
+
+## `Unreleased`
+
+Added
+
+- [#6](https://github.com/VKCOM/php-parser/pull/6): `php8.1`: added `readonly` modifier
+- [#8](https://github.com/VKCOM/php-parser/pull/8): `php8.1`: added `never` type
+- [#10](https://github.com/VKCOM/php-parser/pull/10): `php8.1`: added new octal numbers syntax
+- [#12](https://github.com/VKCOM/php-parser/pull/12): `php8.1`: added enums
+- [#15](https://github.com/VKCOM/php-parser/pull/15): `php8.1`: added `final` modifier for constants in class
+- [#18](https://github.com/VKCOM/php-parser/pull/18): `php8.1`: added first class callable syntax
+
+Changed
+
+- [`4cd50d`](https://github.com/VKCOM/php-parser/commit/85b5d3ef36c9b12923404caf1c57497aa84cd50d): `cmd`: added file path output before errors
+
+## `v0.8.0-rc.2` 2021-30-07
+
+Added
+- [#10](https://github.com/i582/php-parser/pull/10): `php8`: nullsafe operator (`?->`)
+- [#13](https://github.com/i582/php-parser/pull/13): `php8`: named arguments 
+- [#19](https://github.com/i582/php-parser/pull/19): `php8`: `match` expression 
+- [#21](https://github.com/i582/php-parser/pull/21): `php8`: union types in type hints and `static` typehint 
+- [#23](https://github.com/i582/php-parser/pull/23): `php8`: block `catch` without variable 
+- [#25](https://github.com/i582/php-parser/pull/25): `php8`: trailing comma in parameter lists 
+- [#27](https://github.com/i582/php-parser/pull/27): `php8`: `throw` can be used as an expression 
+- [#32](https://github.com/i582/php-parser/pull/32): `php8`: declaring properties in the constructor 
+- [#34](https://github.com/i582/php-parser/pull/34): `php8`: attributes 
+- [#38](https://github.com/i582/php-parser/pull/38): `php8`: trailing comma in closure use list 
+
+Changed
+- [#30](https://github.com/i582/php-parser/pull/30): `php8`: concatenation precedence 
+- [#36](https://github.com/i582/php-parser/pull/36): `php8`: names in the namespace are treated as a single token 
+- [#42](https://github.com/i582/php-parser/pull/42): `php8`: deferencable changes and arbitrary expressions in `new`/`instanceof` 
+
+Removed
+- [#11](https://github.com/i582/php-parser/pull/11): `php8`: removed `(real)` cast 
+- [#15](https://github.com/i582/php-parser/pull/15): `php8`: removed `(unset)` cast 
+- [#17](https://github.com/i582/php-parser/pull/17): `php8`: removed `{}` access 
+
+---
+
+Versions prior to 0.8.0 were not included in this changelog.