Update for 1.8.16 release

We have to burn 1.8.15 since our automation won't allow bumping to a version
string (1.8.16) that has already been bumped to. See aebad5e. So during
the next release, we will release 1.8.16 and bump to 1.8.17.

Author: joshcooper

CHANGELOG.md

@@ -3,9 +3,9 @@
 All significant changes to this repo will be summarized in this file.
 
 
-## [1.8.15](https://github.com/puppetlabs/puppet-resource_api/tree/1.8.15) (2022-10-03)
+## [1.8.16](https://github.com/puppetlabs/puppet-resource_api/tree/1.8.16) (2022-10-03)
 
-[Full Changelog](https://github.com/puppetlabs/puppet-resource_api/compare/1.8.14...1.8.15)
+[Full Changelog](https://github.com/puppetlabs/puppet-resource_api/compare/1.8.14...1.8.16)
 
 **Merged pull requests:**