Added CHANGELOG; updated for 1.0.0

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
+- Pagination for resource lists
+
+## [1.0.0] - 2019-06-22
+### Added
+- Endpoint Categories
+  - Berries (berries, firmness, flavors)
+  - Contests (types, effects, etc.)
+  - Encounters (methods, conditions, etc.)
+  - Evolution (chains, triggers)
+  - Games (generations, versions, etc.)
+  - Locations (areas, regions, etc.)
+  - Machines
+  - Moves (moves, attributes, etc.)
+  - Pokemon (abilities, egg groups, etc.)
+  - Utility (languages)
+- Resource endpoint for resource lists
+- Unit tests for all endpoints
+
+[Unreleased]: https://github.com/mtslzr/pokeapi-go/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/mtslzr/pokeapi-go/releases/tag/v1.0.0