Merge pull request #70 from neuroglia-io/fix-exit-flow-directive-validation

Fixed task `exit` flow directive validation

Author: cdavernas

src/ServerlessWorkflow.Sdk/Validation/TaskDefinitionValidator.cs

@@ -102,7 +102,7 @@ protected virtual bool NotAFlowDirective(TaskDefinition task)
     {
         return task.Then switch
         {
-            null or "" or FlowDirective.Continue or FlowDirective.End or FlowDirective.End => false,
+            null or "" or FlowDirective.Continue or FlowDirective.End or FlowDirective.Exit => false,
             _ => true
         };
     }