Added changelog and php 7.3 travis build (#11)

* Add changelog

Author: akondas

CHANGELOG.md

@@ -0,0 +1,41 @@
+# Changelog
+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).
+
+## Types of changes
+ * **Added** for new features.
+ * **Changed** for changes in existing functionality.
+ * **Deprecated** for soon-to-be removed features.
+ * **Removed** for now removed features.
+ * **Fixed** for any bug fixes.
+ * **Security** in case of vulnerabilities.
+ 
+## [0.4.2] 2018-12-18
+### Fixed
+ * Allow configuration without singletons (#10)
+
+## [0.4.1] 2018-10-25
+### Added
+ * Update phpstan and move it to require-dev
+ * Add php-cs-fixer & fix code-style
+ * Add ServiceMap tests
+ * Travis CI integration
+ * Add .gitattributes
+ 
+## [0.4.0] 2018-08-21
+### Added
+ * Add support for phpstan 0.10.3
+ 
+## [0.3.0] 2018-06-16
+### Added
+ * Add support for phpstan 0.10
+ 
+## [0.2.0] 2018-03-09
+### Added
+ * Provides correct methods and properties for Yii::$app->request
+ 
+## [0.1.0] 2018-03-07
+### Added
+ * first initial release

README.md

@@ -16,7 +16,7 @@
 
 | PHPStan version | Yii2 extension version |
 | --------------- | ---------------------- |
-| 0.10.3          | 0.4.0                  |
+| 0.10.3          | 0.4.x                  |
 | 0.10            | 0.3.0                  |
 | 0.9.2           | 0.2.0                  |