Merge pull request #1378 from HaoZeke/addTowncrier

ENH,MAINT: Add towncrier

changelog.d/+condaChannels.bugfix.rst

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+``conda-forge`` is no longer a default channel for ``mamba``. (#1373)

changelog.d/+matrixReq.bugfix.rst

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+Fixed a bug where ``matrix`` requirements were dropped if an environment file
+was specified. (#1373)

changelog.d/.gitignore

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+!.gitignore

changelog.d/1372.bugfix.rst

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+The ``mamba`` plugin works correctly for newer versions (>=1.5) of
+``libmambapy``

changelog.d/1373.bugfix.rst

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+The ``mamba`` plugin respects the ``MAMBARC`` environment if set, taking
+channels and channel priority from the file in the environment variable.

changelog.d/readme.md

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+# Usage
+
+`towncrier` is used for keeping track of the changelog. The relevant configuration aspects are:
+- Each file can be formatted using reST
+- The contents are rendered in bullets
+- Each file should be labeled with the corresponding **pull request**, e.g. `NUM.TYPE.rst`
+  + Where there is no clear corresponding pull request, `+` can be used instead of `NUM`
+
+For mapping the types to headings, the following table can be used:
+
+
+| **TYPE** | **Heading**                 |
+| feat     | New Features                |
+| api      | API Changes                 |
+| bugfix   | Bug Fixes                   |
+| misc     | Other Changes and Additions |
+
+## Release
+
+
+```bash
+# View the changes
+towncrier build --draft --version 0.6.2 --date "$(date -u +%Y-%m-%d)"
+# Modify CHANGES.rst
+towncrier build --version 0.6.3 --date "$(date -u +%Y-%m-%d)"
+```

towncrier.toml

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+[tool.towncrier]
+directory = "changelog.d"
+filename = "CHANGES.rst"
+underlines = ["-", "^", "~"]
+wrap = true
+
+[[tool.towncrier.type]]
+directory = "feat"
+name = "New Features"
+showcontent = true
+
+[[tool.towncrier.type]]
+directory = "api"
+name = "API Changes"
+showcontent = true
+
+[[tool.towncrier.type]]
+directory = "bugfix"
+name = "Bug Fixes"
+showcontent = true
+
+[[tool.towncrier.type]]
+directory = "misc"
+name = "Other Changes and Additions"
+showcontent = true