Prepare v2.7.0 release

Author: clue

CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG for 2.x
 =================
 
+* 2.7.0 (2018-06-13)
+
+    *   Feature: Improve memory consumption for pending promises by using static internal callbacks without binding to self.
+        (#124 by @clue)
+
 * 2.6.0 (2018-06-11)
 
     *   Feature: Significantly improve memory consumption and performance by only passing resolver args

README.md

@@ -840,10 +840,11 @@ Install
 The recommended way to install this library is [through Composer](https://getcomposer.org).
 [New to Composer?](https://getcomposer.org/doc/00-intro.md)
 
+This project follows [SemVer](https://semver.org/).
 This will install the latest supported version:
 
 ```bash
-$ composer require react/promise:^2.6
+$ composer require react/promise:^2.7
 ```
 
 See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.