Update CHANGELOG.md with details from pull request #6180

Obvious fix; these changes are the result of automation not creative thinking.

CHANGELOG.md

@@ -3,6 +3,8 @@
 <!-- latest_release unreleased -->
 ## Unreleased
 
+#### Merged Pull Requests
+- Update changelog for 0.75.0 release [#6180](https://github.com/habitat-sh/habitat/pull/6180) ([smacfarlane](https://github.com/smacfarlane))
 <!-- latest_release -->
 
 ## [0.75.0](https://github.com/habitat-sh/habitat/tree/0.75.0) (2019-02-12)
@@ -5776,4 +5778,4 @@
 - Automatic Update/Restart of running packages [\#5](https://github.com/habitat-sh/habitat/pull/5) ([reset](https://github.com/reset))
 - 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))
+- Adds functional tests [\#1](https://github.com/habitat-sh/habitat/pull/1) ([adamhjk](https://github.com/adamhjk))