Fix typo

Co-authored-by: Morten Brekkevold <[email protected]>

README.md

@@ -233,7 +233,7 @@ To be able to automatically produce the changelog for a release one file for eac
 pull request (also called news fragment) needs to be added to the folder
 `changelog.d/`.
 
-The name of the file consists of three parts seperated by a period:
+The name of the file consists of three parts separated by a period:
 1. The identifier: either the issue number (in case the pull request fixes that issue)
 or the pull request number. If we don't want to add a link to the resulting changelog
 entry then a `+` followed by a unique short description.