fix: Set bad exit code on error

Otherwise circleci does not fail on bad commit messages

Author: LukasHechenberger

src/cli.js

@@ -1,3 +1,7 @@
 #!/usr/bin/env node
 
-require('..').run().catch(console.error)
+require('..').run()
+  .catch(error => {
+    console.error(error);
+    process.exitCode = 1;
+  })