fix(pr): don’t escape @ in compare links

Closes #3162

lib/workers/pr/pr-body.js

@@ -172,6 +172,11 @@ async function getPrBody(config) {
     releaseNotes = releaseNotes.replace(/@/g, '@​');
     releaseNotes = releaseNotes.replace(/(`\[?@)​/g, '$1');
     releaseNotes = releaseNotes.replace(/([a-z]@)​/gi, '$1');
+    releaseNotes = releaseNotes.replace(/\/compare\/@​/g, '/compare/@');
+    releaseNotes = releaseNotes.replace(
+      /(\(https:\/\/[^)]*?)\.\.\.@​/g,
+      '$1...@'
+    );
     releaseNotes = releaseNotes.replace(
       /([\s(])#(\d+)([)\s]?)/g,
       '$1#​$2$3'