typo fix in CHANGELOG

Author: tskirvin

CHANGELOG.md

@@ -9,7 +9,7 @@ All notable changes to this project will be documented in this file. The format
 There are cases where spaces and quotes in iptables comments generated by
 mainstream sources (e.g. podman) were causing rules to not parse properly.
 We didn't fix the whole problem, but we removed those comments for parsing
-purposes.1
+purposes.
 
 ## [v3.0.0](https://github.com/puppetlabs/puppetlabs-firewall/tree/v3.0.0) (2021-03-01)