Unfill lines when generating release notes

Author: Wilfred

justfile

@@ -27,7 +27,7 @@ rel_notes:
 
     echo -e "Difftastic is a structural diff tool that understands syntax. See [the manual](https://difftastic.wilfred.me.uk/) to get started, and [the changelog](https://github.com/Wilfred/difftastic/blob/master/CHANGELOG.md) for historical changes.\n"
 
-    rg --max-count 1 -B 9999 "released " CHANGELOG.md | tail -n +3 | head -n -2
+    rg --max-count 1 -B 9999 "released " CHANGELOG.md | tail -n +3 | head -n -2 | awk 'BEGIN{RS="\n\n"; ORS="\n\n"} {gsub(/\n/, " "); print}'
 
 man:
     pandoc --standalone --to man difft.1.md -o difft.1