CSharp RestSharp snippets don't generate valid members of `RestSharp.Method` enum

[michaelgwelch]

Here's a portion of the code generated from a csharp RestSharp code snippet

var request = new RestRequest(Method.GET);

The issue is that the actual member we need is Method.Get as shown in the source code here:

https://github.com/restsharp/RestSharp/blob/0fba5e727d241b1867bd71efc912594075c2934b/src/RestSharp/Enum.cs#L70

None of the Http Verbs are upper-cased in the enum definition.

Seems like I relatively easy fix. I'll try to write a PR.