Create CHANGELOG.md and add all unreleased changes since 0.1.3

CHANGELOG.md

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+# Changelog
+
+## Unreleased
+
+### Added
+
+- [Task System for Bevy][384]
+  - Replaces rayon with a custom designed task system that consists of several "TaskPools".
+  - Exports `IOTaskPool`, `ComputePool`, and `AsyncComputePool` in `bevy_tasks` crate.
+- [Added support for binary glTF (.glb).][271]
+- [Added support for 'or' in ECS querying for tuple queries.][358]
+- [Added `Color::hex`][362] to create a `Color` from hex values.
+  - supports RGB , RGBA, RRGGBB, and RRGGBBAA.
+- [Added `Color::rgb_u8` and `Color::rgba_u8`.][381]
+- [Added `bevy_render::pass::ClearColor` to prelude.][396]
+- [Added methods on `Input<T>`][428] for access to all pressed/just_pressed/just_released keys.
+  - `{get_pressed, get_just_pressed, get_just_released}`
+- [Derived `Clone` for UI component bundles.][390]
+- Tips for faster builds on macos: [#312][312], [#314][314], [#433][433]
+- Added and documented cargo features
+  - [Created document `docs/cargo_features.md`.][249]
+  - [Added features for x11 and wayland display servers.][249]
+  - [and added a feature to disable libloading.][363] (helpful for WASM support)
+- Added more instructions for linux dependencies: [Arch / Manjaro][275], [NixOS][290], and [Solus][331]
+
+### Changed
+
+- [Bump entities to u128 to avoid collisions][393]
+- [Send an AssetEvent when modifying using `get_id_mut`][323]
+- [Rename `Assets::get_id_mut` -> `Assets::get_with_id_mut`][332]
+- [Support multiline text in `DrawableText`][183]
+- [Some examples of documentation][338]
+- [iOS: use shaderc-rs for glsl to spirv compilation][324]
+- [Changed the default node size to Auto instead of Undefined to match the Stretch implementation.][304]
+- Many improvements to Bevy's CI [#325][325], [#349][349], [#357][357], [#373][373], [#423][423]
+
+### Fixed
+
+- [Properly track added and removed RenderResources in RenderResourcesNode.][361]
+  - Fixes issues where entities vanished or changed color when new entities were spawned/despawned.
+- [Fixed sprite clipping at same depth][385]; transparent sprites should no longer clip.
+- [Check asset path existence][345]
+- [Fixed deadlock in hot asset reloading][376]
+- [Fixed hot asset reloading on Windows][394]
+- [Allow glTFs to be loaded that don't have uvs and normals][406]
+- [Fixed archetypes_generation being incorrectly updated for systems][383]
+- [Remove child from parent when it is despawned][386]
+
+
+[183]: https://github.com/bevyengine/bevy/pull/183
+[249]: https://github.com/bevyengine/bevy/pull/249
+[271]: https://github.com/bevyengine/bevy/pull/271
+[275]: https://github.com/bevyengine/bevy/pull/275
+[290]: https://github.com/bevyengine/bevy/pull/290
+[304]: https://github.com/bevyengine/bevy/pull/304
+[312]: https://github.com/bevyengine/bevy/pull/312
+[314]: https://github.com/bevyengine/bevy/pull/314
+[323]: https://github.com/bevyengine/bevy/pull/323
+[324]: https://github.com/bevyengine/bevy/pull/324
+[325]: https://github.com/bevyengine/bevy/pull/325
+[331]: https://github.com/bevyengine/bevy/pull/331
+[332]: https://github.com/bevyengine/bevy/pull/332
+[338]: https://github.com/bevyengine/bevy/pull/332
+[345]: https://github.com/bevyengine/bevy/pull/345
+[349]: https://github.com/bevyengine/bevy/pull/349
+[357]: https://github.com/bevyengine/bevy/pull/357
+[358]: https://github.com/bevyengine/bevy/pull/358
+[361]: https://github.com/bevyengine/bevy/pull/361
+[362]: https://github.com/bevyengine/bevy/pull/362
+[363]: https://github.com/bevyengine/bevy/pull/363
+[373]: https://github.com/bevyengine/bevy/pull/373
+[376]: https://github.com/bevyengine/bevy/pull/376
+[381]: https://github.com/bevyengine/bevy/pull/381
+[383]: https://github.com/bevyengine/bevy/pull/383
+[384]: https://github.com/bevyengine/bevy/pull/384
+[385]: https://github.com/bevyengine/bevy/pull/385
+[386]: https://github.com/bevyengine/bevy/pull/386
+[390]: https://github.com/bevyengine/bevy/pull/390
+[393]: https://github.com/bevyengine/bevy/pull/393
+[394]: https://github.com/bevyengine/bevy/pull/394
+[396]: https://github.com/bevyengine/bevy/pull/396
+[406]: https://github.com/bevyengine/bevy/pull/406
+[423]: https://github.com/bevyengine/bevy/pull/423
+[428]: https://github.com/bevyengine/bevy/pull/428
+[433]: https://github.com/bevyengine/bevy/pull/433
+
+
+## Version 0.1.3 (2020-8-22)
+
+## Version 0.1.2 (2020-8-10)
+
+## Version 0.1.1 (2020-8-10)
+
+## Version 0.1.0 (2020-8-10)