Generate changelog; add PR template

.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 (#0 by @)")
+- [ ] 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:
+- Stop mangled 'Compiled ModuleName' output (#228 by @JordanMartinez)
+- Update dev instructions: create valid symbolic link across OSes (#226 by @JordanMartinez)
+- Added a changelog (#229 by @JordanMartinez)
+
+## [v2021-05-29.1](https://github.com/purescript/trypurescript/releases/tag/v2021-05-29.1) - 2021-05-29
+
+This release officially adds support for PureScript 0.14 to Try PureScript, among many other (largely internal) improvements and updates.
+
+* Updated the compiler and package set for PureScript 0.14 (#209, #213, #224 by @thomashoneyman, #223 by @JordanMartinez)
+* Updated local development instructions (#221 by @JordanMartinez, #225 by @thomashoneyman)
+* Added support for loading files from GitHub repositories and migrated examples into the Try PureScript repository (#218 by @thomashoneyman)
+* Migrated the client to Halogen from JQuery (#215 by @thomashoneyman)
+* Migrated the client to `argonaut-codecs` from `foreign-generic` (#212, #217 by @thomashoneyman)
+* Migrated the client to `Aff` from `ContT` (#208 by @thomashoneyman)
+* Added fixtures to test API responses (#211 by @thomashoneyman)
+* Removed unused pragmas, imports, and definitions from server code (#206 by @thomashoneyman)
+* Allowed form submission in the Try PureScript iframe (#203 by @mikesol)
+* Switch to use a svg favicon with ico fallback (#191 by @milesfrain)
+* Implement `encode` in PureScript instead of in FFI (#186 by @maxdeviant)
+
+## [v2020-07-11.1](https://github.com/purescript/trypurescript/releases/tag/v2020-07-11.1) - 2020-07-11
+
+* Enable automated SSL certificate renewal (#184, @hdgarrood)
+* Remove unused `parsec` dependency (#178, @hdgarrood)
+* Only listen on 127.0.0.1 (#177, @hdgarrood)
+
+## [v2020-05-26.1](https://github.com/purescript/trypurescript/releases/tag/v2020-05-26.1) - 2020-05-26
+
+* Update to PureScript v0.13.8 (#175, @hdgarrood
+* Make the whole package set available (#173, @hdgarrood, @thomashoneyman)
+* Do away with version numbers (#176, @hdgarrood)
+
+## [v0.13.7](https://github.com/purescript/trypurescript/releases/tag/v0.13.7) - 2020-05-03
+
+* Fix help link (#165, @hdgarrood)
+* Update API documentation in readme (#168, @hdgarrood)
+
+## [v0.13.6](https://github.com/purescript/trypurescript/releases/tag/v0.13.6) - 2020-05-03
+
+* Update to v0.13.6 of the PureScript compiler
+* minor tweaks to get deploys working
+
+## [v0.13.5](https://github.com/purescript/trypurescript/releases/tag/v0.13.5) - 2020-05-02
+
+* Update to v0.13.5 of the compiler (@natefaubion)
+* Remove backends, serve individual modules on demand (@natefaubion, @gabejohnson, #128, #136)
+* Host the client ourselves rather than using GH pages
+* Put all source files in one branch (@gabejohnson, #135)
+* Fix gist navigation within the iframe (@natefaubion, #140)
+* Use different sourceURL syntax per warnings (@natefaubion, #141)
+* Switch to spago for managing PS dependencies (@hdgarrood, #147, #150)
+* Build the frontend in CI (@hdgarrood, #152)
+* Mostly automated deployments (@hdgarrood)
+
+## [v0.12.0-rc.5](https://github.com/purescript/trypurescript/releases/tag/v0.12.0-rc.5) - 2020-05-02
+
+Testing deployment
+
+## [v0.12.0-rc.4](https://github.com/purescript/trypurescript/releases/tag/v0.12.0-rc.4) - 2020-05-02
+
+Testing deployment
+
+## [v0.12.0-rc.3](https://github.com/purescript/trypurescript/releases/tag/v0.12.0-rc.3) - 2020-05-02
+
+Testing deployment
+
+## [v0.12.0-rc.2](https://github.com/purescript/trypurescript/releases/tag/v0.12.0-rc.2) - 2020-05-02
+
+Testing deployment
+
+## [v0.12.0-rc.1](https://github.com/purescript/trypurescript/releases/tag/v0.12.0-rc.1) - 2020-05-02
+
+Mostly for testing the new deployment mechanisms.
+
+## [v0.11.7](https://github.com/purescript/trypurescript/releases/tag/v0.11.7) - 2017-11-30
+
+Update to 0.11.7 (@Thimoteus)
+
+## [v0.11.6.1](https://github.com/purescript/trypurescript/releases/tag/v0.11.6.1) - 2017-09-01
+
+Return warnings from API
+
+## [v0.11.6](https://github.com/purescript/trypurescript/releases/tag/v0.11.6) - 2017-07-11
+
+Updates for the v0.11.6 compiler
+
+## [v0.11.2](https://github.com/purescript/trypurescript/releases/tag/v0.11.2) - 2017-04-02
+
+Update to 0.11.2 compiler
+
+## [v0.11.1](https://github.com/purescript/trypurescript/releases/tag/v0.11.1) - 2017-04-01
+
+Updates for 0.11.1 compiler.
+
+## [v0.10.5](https://github.com/purescript/trypurescript/releases/tag/v0.10.5) - 2017-01-16
+
+Update compiler and add basic type search
+
+## [v0.10.4](https://github.com/purescript/trypurescript/releases/tag/v0.10.4) - 2017-01-02
+
+Update to compiler v0.10.4
+
+## [v0.10.3](https://github.com/purescript/trypurescript/releases/tag/v0.10.3) - 2016-12-18
+
+Update to 0.10.3, use JSON errors.
+
+## [v0.10.2](https://github.com/purescript/trypurescript/releases/tag/v0.10.2) - 2016-11-11
+
+New version using compiler v0.10.2
+
+## [v0.9.1.1](https://github.com/purescript/trypurescript/releases/tag/v0.9.1.1) - 2016-06-17
+
+
+
+## [v0.9.1](https://github.com/purescript/trypurescript/releases/tag/v0.9.1) - 2016-06-17
+
+
+
+## [v0.8.2.0](https://github.com/purescript/trypurescript/releases/tag/v0.8.2.0) - 2016-03-11
+
+Updates for v0.8.2 compiler