fix: go sdk generates

Author: dsinghvi

fern/generators.yml

@@ -1,9 +1,9 @@
 api:
-  specs:
-    - openapi: ../openapi.json
-      overrides: ../openapi-overrides.yml
-      settings:
-        title-as-schema-name: false
+  path: ../openapi.json
+  overrides: ../openapi-overrides.yml
+  settings:
+    use-title: false
+    unions: v1
 groups:
   python-sdk:
     generators:
@@ -54,7 +54,7 @@ groups:
         github:
           repository: fern-demo/vapi-go-sdk
         config: 
-          unions: v1
+          union: v1
   ruby-sdk:
     generators:
       - name: fernapi/fern-ruby-sdk