Remove github_changelog_generator credits from Changelog
We're using Expeditor now!
- Set up initial Delivery acceptance environment [\#4](https://github.com/habitat-sh/habitat/pull/4) ([fnichol](https://github.com/fnichol))
- Update Setup & Development instructions for Delivery/GitHub workflow. [\#3](https://github.com/habitat-sh/habitat/pull/3) ([fnichol](https://github.com/fnichol))
- Adds functional tests [\#1](https://github.com/habitat-sh/habitat/pull/1) ([adamhjk](https://github.com/adamhjk))
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-\* *This Change Log was automatically generated by [github_changelog_generator](https://github.com/skywinder/Github-Changelog-Generator)*
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