Add CHANGELOG

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], and this project adheres to 
+[Semantic Versioning].
+
+## [Unreleased]
+
+## [0.1.0] - 2019-11-27
+
+### Added
+- Swift library module `AlphaVantage`:
+  - Partial implementation of `Stock Time Series` functions including 
+    `TIME_SERIES_INTRADAY`, `TIME_SERIES_DAILY`, and 
+    `TIME_SERIES_DAILY_ADJUSTED`.
+- Command line executable:
+  - Basic command line interface.
+  - Command `sav stock <intraday/daily/daily-adjusted> <symbol> [options]`
+
+[Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
+[Semantic Versioning]: https://semver.org/spec/v2.0.0.html
+[Unreleased]: https://github.com/iamWing/swift-alpha-vantage/compare/0.1.0...HEAD
+[0.1.0]: https://github.com/iamWing/swift-alpha-vantage/releases/tag/0.1.0