Update gen.yaml (#284)

Set correct version. This needs to be major as we are replacing the current version with bill pay kit.

Author: dcoplowe

sync-for-payables/.speakeasy/gen.yaml

@@ -12,7 +12,7 @@ generation:
   auth:
     oAuth2ClientCredentialsEnabled: false
 csharp:
-  version: 3.2.0
+  version: 4.0.0
   additionalDependencies: []
   author: Codat
   description: Streamline your customers' accounts payable workflow.
@@ -35,4 +35,4 @@ csharp:
   outputModelSuffix: output
   packageName: Codat.Sync.Payables
   packageTags: ""
-  responseFormat: envelope
+  responseFormat: envelope