removed Usage section

Author: Matt Bernier

README.md

@@ -85,20 +85,6 @@ Console.WriteLine(response.StatusCode);
 Console.WriteLine(response.Body.ReadAsStringAsync().Result);
 Console.WriteLine(response.Headers.ToString());
 ```
-<a name="usage"></a>
-# Usage
-
-- [Example Code](https://github.com/sendgrid/csharp-http-client/blob/master/Example/Example.cs)
-
-## Environment Variables 
-
-You can do the following to create a .env file:
-
-```cp .env_example .env```
-
-Then, just add your API Key into your .env file.
-
-
 <a name="roadmap"></a>
 # Roadmap