fix: missing CHANGELOG output

Author: dragonraid

src/index.ts

@@ -50,6 +50,7 @@ const getConfig = (): Config => {
         core.info(`Changelog:\n${changelogContent}`);
         core.setOutput('changelog', changelogContent);
         core.setOutput('isEmpty', changelog.isEmpty);
+        core.setOutput('CHANGELOG', changelogContent);
         core.exportVariable('IS_EMPTY', changelog.isEmpty);
         core.info('Finished!');
     } catch (error) {