Prepare v1.0.0 release

Author: clue

CHANGELOG.md

@@ -0,0 +1,5 @@
+# Changelog
+
+## 1.0.0 (2018-12-19)
+
+*   First stable release, following SemVer

README.md

@@ -457,12 +457,15 @@ $proxy = new SshProcessConnector(
 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 clue/reactphp-ssh-proxy:dev-master
+$ composer require clue/reactphp-ssh-proxy:^1.0
 ```
 
+See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.
+
 This project aims to run on any platform and thus does not require any PHP
 extensions and supports running on legacy PHP 5.3 through current PHP 7+ and
 HHVM.