Add changelog and pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+## Overview
+
+Brief description of what this PR does, and why it is needed.
+
+### Checklist
+
+- [ ] Description of PR is in an appropriate section of the CHANGELOG and grouped with similar changes if possible
+
+### Demo
+
+Optional. Screenshots, `http` examples, etc.
+
+### Notes
+
+Optional. Ancillary topics, caveats, alternative strategies that didn't work out, anything else.
+
+## Testing Instructions
+
+- How to test this PR
+- Prefer bulleted description
+- Start after checking out this branch
+- Include any setup required, such as bundling scripts, restarting services, etc.
+- Include test case, and expected output
+
+Closes #XXX

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
+- Add README [#92](https://github.com/geotrellis/maml/pull/92)
+- Add STRTA and migrate to CircleCI [#93](https://github.com/geotrellis/maml/pull/93)
+- Add changelog and pull request template [#96](https://github.com/geotrellis/maml/pull/96)
+
+## [0.3.2] - 2019-04-17
+### Added
+- Add hillshade [#77](https://github.com/geotrellis/maml/pull/77)
+
+### Changed
+- Upgrade circe version to 0.11.1 [#78](https://github.com/geotrellis/maml/pull/77)
+- Use methods to create key decoders [#79](https://github.com/geotrellis/maml/pull/79)
+- Mask on LazyMultibandRasters directly [#89](https://github.com/geotrellis/maml/pull/89)
+- Assume correct extents in binary ops to avoid floating point errors [#91](https://github.com/geotrellis/maml/pull/91)
+
+[Unreleased]: https://github.com/geotrellis/maml/compare/0.3.2...HEAD
+[0.3.2]: https://github.com/geotrellis/maml/compare/v0.2.2...0.3.2