Update CHANGELOG.md

Author: evgeny-krylov

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](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2018-07-31
+### Added
+- Get all scaffolds API
+- Get scaffold API
+- Deploy scaffold API
+- Set scaffold webhook API
+- Get scaffold summary API
+- Deactivate scaffold API
+- Get scaffold quota API
+- Add shareholder API
+- Update shareholder API
+- Remove shareholder API
+- Get all transactions API
+- Tests
+
+[1.0.0]: https://github.com/OpenFuturePlatform/open-api-python-sdk/compare/e8d583f41e071d56dbc6dcf924bcc3a35c85b302...v1.0.0