"OrchestrationTrigger must be attached to a DurableOrchestrationContext" given when using `IDurableOrchestrationContext`

Similar to #10, but this is for the correct usage via `IDurableOrchestrationContext`
e.g.
`        public async Task RunOrchestratorAsync([OrchestrationTrigger] IDurableOrchestrationContext context)
`

gives 

```c#
Severity	Code	Description	
Warning	DurableFunctionOrchestrationTriggerAnalyzer	OrchestrationTrigger must be attached to a DurableOrchestrationContext	
```