Rearrange changelog and contributing docs

CHANGELOG.md

@@ -0,0 +1,62 @@
+# Changelog
+
+Notable changes to this project are 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]
+
+Breaking changes (😱!!!):
+
+New features:
+
+Bugfixes:
+
+Other improvements:
+
+## [v4.1.1](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v4.1.1) - 2019-01-12
+
+- Expand documentation
+
+## [v4.1.0](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v4.1.0) - 2018-09-09
+
+- Export `null` and `notNull` (@bklaric)
+
+## [v4.0.0](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v4.0.0) - 2018-05-24
+
+- Updated for PureScript 0.12
+
+## [v3.0.0](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v3.0.0) - 2017-04-02
+
+- Updates for 0.11 compiler
+
+## [v2.0.0](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v2.0.0) - 2016-10-17
+
+- Updated dependencies
+
+## [v1.0.1](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v1.0.1) - 2016-06-13
+
+- Fix `bower.json` (@kika)
+
+## [v1.0.0](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v1.0.0) - 2016-06-02
+
+- Updates for 1.0 core libraries.
+
+## [v0.2.1](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v0.2.1) - 2015-07-24
+
+- Fix `null` issue spotted by @Javran.
+
+## [v0.2.0](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v0.2.0) - 2015-06-30
+
+- This release works with versions 0.7.\* of the PureScript compiler. It will not work with older versions. If you are using an older version, you should require an older, compatible version of this library.
+
+## [v0.2.0-rc.1](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v0.2.0-rc.1) - 2015-06-19
+
+- Release for the 0.7 compiler.
+
+## [v0.1.1](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v0.1.1) - 2015-03-07
+
+- Handle `undefined`.
+
+## [v0.1.0](https://github.com/purescript-contrib/purescript-nullable/releases/tag/v0.1.0) - 2015-01-29
+
+- Initial release
+

README.md

@@ -24,7 +24,7 @@ The quick start hasn't been written yet (contributions are welcome!). The quick
 `nullable` documentation is stored in a few places:
 
 1. Module documentation is [published on Pursuit](https://pursuit.purescript.org/packages/purescript-nullable).
-2. Written documentation and [the changelog](./docs/CHANGELOG.md) are kept in [the docs directory](./docs).
+2. Written documentation is kept in the [docs directory](./docs).
 3. Usage examples can be found in [the test suite](./test).
 
 If you get stuck, there are several ways to get help:
@@ -38,6 +38,6 @@ You can contribute to `nullable` in several ways:
 
 1. If you encounter a problem or have a question, please [open an issue](https://github.com/purescript-contrib/purescript-nullable/issues). We'll do our best to work with you to resolve or answer it.
 
-2. If you would like to contribute code, tests, or documentation, please [read the contributor guide](./.github/CONTRIBUTING.md). It's a short, helpful introduction to contributing to this library, including development instructions.
+2. If you would like to contribute code, tests, or documentation, please [read the contributor guide](./CONTRIBUTING.md). It's a short, helpful introduction to contributing to this library, including development instructions.
 
 3. If you have written a library, tutorial, guide, or other resource based on this package, please share it on the [PureScript Discourse](https://discourse.purescript.org)! Writing libraries and learning resources are a great way to help this library succeed.

docs/README.md

@@ -1,3 +1,3 @@
 # Nullable Documentation
 
-This directory contains documentation for `nullable`. If you are interested in contributing new documentation, please read the [contributor guidelines](../.github/CONTRIBUTING.md) and [What Nobody Tells You About Documentation](https://documentation.divio.com) for help getting started.
+This directory contains documentation for `nullable`. If you are interested in contributing new documentation, please read the [contributor guidelines](../CONTRIBUTING.md) and [What Nobody Tells You About Documentation](https://documentation.divio.com) for help getting started.