Make PR references clickable

cliff.toml

@@ -11,7 +11,7 @@ filter_unconventional = false
 split_commits = false
 # regex for preprocessing the commit messages
 commit_preprocessors = [
-    # { pattern = '\((\w+\s)?#([0-9]+)\)', replace = "([#${2}](https://github.com/orhun/git-cliff/issues/${2}))"}, # replace issue numbers
+    { pattern = '\((\w+\s)?#([0-9]+)\)', replace = "([#${2}](https://github.com/deltachat/deltachat-core-rust/PR/${2}))"}, # replace pull request / issue numbers
 ]
 # regex for parsing and grouping commits
 commit_parsers = [