title: Cannot change region of functions on flutter
body: <p>Ive switched my functions regions from the US default and I cannot find a way to call them in flutter?</p>
  
  <p>Is there a method of setting the region on the CloudFunctions instance or when you make the function calls</p>
  
  <p>Thanks for the help.</p>
  
  <hr>
  
  <p>I have managed to get this to work </p>
  
  <pre><code> CloudFunctions(app: FirebaseApp.instance, region: "europe-west2").getHttpsCallable(functionName: functionName);
  </code></pre>
  
  <p>But I am no longer using the singleton. </p>
  
  <p>Is this a bad solution?</p>