Minor: improve log output on Windows

lib/installCertutil.js

@@ -15,6 +15,7 @@ export default function installCertutil () {
   } else if (platform === 'win32') {
     // Do nothing. According to the mkcert documentation, certutil is not
     // required on Windows.
+    log('done.')
   } else {
     // Unknown platform. This should have been caught earlier. Panic.
     throw new Error('   🤯     ❨auto-encrypt-localhost❩ Panic: Unknown platform detected.', platform)