Changelog and fix two psalm issues (#153)

Author: NicolasCARPi

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [2.1.0] - 2020-06-01
+### Changed
+- Don't execute ob_flush() when output buffering is not enabled (#152)
+- Fix inconsistent return type on 32-bit systems (#149) Fix #144
+- Use mbstring polyfill (#151)
+- Promote 7zip usage over unzip to avoid UTF-8 issues (#147)
+
 ## [2.0.0] - 2020-02-22
 ### Breaking change
 - Only the self opened streams will be closed (#139)

src/Option/Method.php

@@ -10,9 +10,10 @@
  *
  * @method static STORE(): Method
  * @method static DEFLATE(): Method
+ * @psalm-immutable
  */
 class Method extends Enum
 {
     const STORE = 0x00;
     const DEFLATE = 0x08;
-}
+}

src/Option/Version.php

@@ -12,10 +12,11 @@
  * @method static STORE(): Version
  * @method static DEFLATE(): Version
  * @method static ZIP64(): Version
+ * @psalm-immutable
  */
 class Version extends Enum
 {
     const STORE = 0x000A; // 1.00
     const DEFLATE = 0x0014; // 2.00
     const ZIP64 = 0x002D; // 4.50
-}
+}