docs: add changelog

Author: ecastro98

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.0.1] - 2019-10-03
+### Fixed
+- Return null if data from server is empty when calling to a server function
+
+## [1.0.0] - 2019-09-05
+### Added
+- Add server model for IP and port
+- Add authentication model for user and password
+- Add possibility of choosing the http client, request and stream factory
+- Add `call` property in `Resource` class to call functions
+
+### Changed
+- Uppercase first character of mta class
+- Change parameter types of Mta class
+
+## [0.4.0] - 2009-10-06
+### Changed
+- Renamed `public function mta(..)` to `public function __construct(..)`.
+
+## [0.3.0] - 2008-04-17
+### Added
+- Neater syntax, support functions for callRemote (fix version makes call work with args)
+
+## [0.2.0] - 2007-07-10
+### Added
+- Add authentication support
+
+## [0.1.0] - 2007-06-26
+### Added
+- Initial release
+
+[Unreleased]: https://github.com/multitheftauto/mtasa-php-sdk/compare/1.0.1...HEAD
+[1.0.1]: https://github.com/multitheftauto/mtasa-php-sdk/compare/1.0.0...1.0.1
+[1.0.0]: https://github.com/multitheftauto/mtasa-php-sdk/compare/v0.4.0...1.0.0
+[0.4.0]: https://github.com/multitheftauto/mtasa-php-sdk/compare/v0.3.0...v0.4.0
+[0.3.0]: https://github.com/multitheftauto/mtasa-php-sdk/compare/v0.2.0...v0.3.0
+[0.2.0]: https://github.com/multitheftauto/mtasa-php-sdk/compare/v0.1.0...v0.2.0
+[0.1.0]: https://github.com/multitheftauto/mtasa-php-sdk/releases/tag/v0.1.0