Add support for europe-west3 region. (#627)

Author: zub0r

spec/function-builder.spec.ts

@@ -59,6 +59,7 @@ describe('FunctionBuilder', () => {
         'us-east4',
         'europe-west1',
         'europe-west2',
+        'europe-west3',
         'asia-east2',
         'asia-northeast1'
       )
@@ -71,6 +72,7 @@ describe('FunctionBuilder', () => {
       'us-east4',
       'europe-west1',
       'europe-west2',
+      'europe-west3',
       'asia-east2',
       'asia-northeast1',
     ]);

src/function-configuration.ts

@@ -7,6 +7,7 @@ export const SUPPORTED_REGIONS = [
   'us-east4',
   'europe-west1',
   'europe-west2',
+  'europe-west3',
   'asia-east2',
   'asia-northeast1',
 ] as const;