Add and fill CHANGELOG.md

Author: mxstbr

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file. If a contribution does not have a mention next to it, [@mxstbr](https://github.com/mxstbr) did it.
+
+*The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](http://semver.org/).*
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+## [v1.1.0]
+
+### Added
+
+- Change the database filepath with the `DB_PATH` env variable. (e.g. `DB_PATH=analytics.db micro-analytics`) (see [#5](https://github.com/mxstbr/micro-analytics/pull/5))
+
+### Changed
+
+- Refactor some core code to be more concise, thanks to [@wpcarro](https://github.com/@wpcarro)! (see [#7](https://github.com/mxstbr/micro-analytics/pull/7))
+
+[Unreleased]: https://github.com/styled-components/styled-components/compare/v1.1.0...master
+[v1.1.0]: https://github.com/styled-components/styled-components/compare/v1.0.1...v1.1.0