Generate changelog and add PR template (#24)

* Generate CHANGELOG.md file using notes from previous GH releases

* Add pull request template

Author: JordanMartinez

.github/PULL_REQUEST_TEMPLATE.md

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+**Description of the change**
+
+Clearly and concisely describe the purpose of the pull request. If this PR relates to an existing issue or change proposal, please link to it. Include any other background context that would help reviewers understand the motivation for this PR.
+
+---
+
+**Checklist:**
+
+- [ ] Added the change to the changelog's "Unreleased" section with a reference to this PR (e.g. "- Made a change (#0000)")
+- [ ] Linked any existing issues or proposals that this pull request should close
+- [ ] Updated or added relevant documentation
+- [ ] Added a test for the contribution (if applicable)

CHANGELOG.md

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+# 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:
+
+## [v4.1.0](https://github.com/purescript/purescript-identity/releases/tag/v4.1.0) - 2018-10-23
+
+- Added `Foldable1` and `Traversable1` instances
+- Added instances for the `-WithIndex` classes
+
+(@MonoidMusician)
+
+## [v4.0.0](https://github.com/purescript/purescript-identity/releases/tag/v4.0.0) - 2018-05-23
+
+Updated for PureScript 0.12
+
+## [v3.1.0](https://github.com/purescript/purescript-identity/releases/tag/v3.1.0) - 2017-04-24
+
+- Added `Eq1` and `Ord1` instances
+
+## [v3.0.0](https://github.com/purescript/purescript-identity/releases/tag/v3.0.0) - 2017-03-26
+
+- Updated for PureScript 0.11
+
+## [v2.1.0](https://github.com/purescript/purescript-identity/releases/tag/v2.1.0) - 2017-03-23
+
+- Added `Lazy` instance (@matthewleon)
+
+## [v2.0.0](https://github.com/purescript/purescript-identity/releases/tag/v2.0.0) - 2016-10-03
+
+- Updated dependencies
+
+## [v1.1.0](https://github.com/purescript/purescript-identity/releases/tag/v1.1.0) - 2016-07-19
+
+- Added instance for `Alt` (@paluh)
+
+## [v1.0.0](https://github.com/purescript/purescript-identity/releases/tag/v1.0.0) - 2016-06-01
+
+This release is intended for the PureScript 0.9.1 compiler and newer.
+
+**Note**: The v1.0.0 tag is not meant to indicate the library is “finished”, the core libraries are all being bumped to this for the 0.9 compiler release so as to use semver more correctly.
+
+## [v1.0.0-rc.2](https://github.com/purescript/purescript-identity/releases/tag/v1.0.0-rc.2) - 2016-03-27
+
+- Updated for new `Prelude` class hierarchies
+
+## [v1.0.0-rc.1](https://github.com/purescript/purescript-identity/releases/tag/v1.0.0-rc.1) - 2016-03-13
+
+- Release candidate for the psc 0.8+ core libraries
+
+## [v0.4.1](https://github.com/purescript/purescript-identity/releases/tag/v0.4.1) - 2015-11-01
+
+- Removed unused imports
+
+## [v0.4.0](https://github.com/purescript/purescript-identity/releases/tag/v0.4.0) - 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.
+
+## [v0.4.0-rc.1](https://github.com/purescript/purescript-identity/releases/tag/v0.4.0-rc.1) - 2015-06-07
+
+Initial release candidate of the library intended for the 0.7 compiler.
+
+## [v0.3.0](https://github.com/purescript/purescript-identity/releases/tag/v0.3.0) - 2015-02-21
+
+**This release requires PureScript v0.6.8 or later**
+- Updated dependencies
+
+## [v0.2.0](https://github.com/purescript/purescript-identity/releases/tag/v0.2.0) - 2015-01-10
+
+- Updated `purescript-foldable-traversable` dependency (@philopon)
+
+## [v0.1.0](https://github.com/purescript/purescript-identity/releases/tag/v0.1.0) - 2014-11-01
+
+- Initial release
+