Prepare v0.5.8 release

Author: clue

CHANGELOG.md

@@ -1,5 +1,14 @@
 # Changelog
 
+## 0.5.8 (2018-02-09)
+
+*   Support legacy PHP 5.3 through PHP 7.2 and HHVM
+    (#126 and #127 by @clue)
+
+*   Improve backwards compatibility with Promise v1 and
+    use RingCentral to improve interoperability with react/http.
+    (#124 and #125 by @clue)
+
 ## 0.5.7 (2018-02-08)
 
 *   Fix: Ignore excessive whitespace in chunk header for `Transfer-Encoding: chunked`

README.md

@@ -164,7 +164,7 @@ The recommended way to install this library is [through Composer](https://getcom
 This will install the latest supported version:
 
 ```bash
-$ composer require react/http-client:^0.5.7
+$ composer require react/http-client:^0.5.8
 ```
 
 See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.