Prepare v1.6.0 release

Author: clue

CHANGELOG.md

@@ -1,5 +1,14 @@
 # Changelog
 
+## 1.6.0 (2020-07-10)
+
+*   Feature: Forward compatibility with react/promise v3.
+    (#37 by @WyriHaximus)
+
+*   Improve test suite and add `.gitattributes` to exclude dev files from exports.
+    Run tests on PHPUnit 9 and PHP 7.4 and clean up test suite.
+    (#38 by @WyriHaximus, #39 by @reedy, #41 by @clue and #42 by @SimonFrings)
+
 ## 1.5.1 (2019-03-27)
 
 *   Fix: Typo in readme

README.md

@@ -342,7 +342,7 @@ This project follows [SemVer](https://semver.org/).
 This will install the latest supported version:
 
 ```bash
-$ composer require react/promise-timer:^1.5
+$ composer require react/promise-timer:^1.6
 ```
 
 See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.