feat: log with signale and allow to customize stdin and stdout

lib/get-commits.js

@@ -24,7 +24,7 @@ module.exports = async ({cwd, env, lastRelease: {gitHead}, logger}) => {
     commit.gitTags = commit.gitTags.trim();
     return commit;
   });
-  logger.log('Found %s commits since last release', commits.length);
+  logger.log(`Found ${commits.length} commits since last release`);
   debug('Parsed commits: %o', commits);
   return commits;
 };