Add changelog (from master)

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]
+
+### Added
+
+- Periodic CVRP scheduling option
+- Initial solution for CVRP computed with Greedy Algorithm
+- Diving heuristic (controlled with new paramater in `VehicleRoutingProblem.solve`)
+
+### Changed
+
+- Master problem formulation to column-based
+- Benchmark tests
+
+## [v0.2.0] - 07/06/2020
+
+### Added
+
+- Mixed fleet option
+- Greedy randomized pricing option
+- Stabilization with Interior Points
+- Diving heuristic WIP
+
+### Changed
+
+- Pricing strategy names
+
+
+[Unreleased]: https://github.com/Kuifje02/vrpy/compare/0.2.0...master
+[v0.2.0]: https://github.com/Kuifje02/vrpy/compare/0.1.0...0.2.0