Update README.md

Author: jdeigendesch

README.md

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 # ASP.NET Core Example
-<h3>This is an example of a REST API with ASP.NET Core v1.0, which is made via following tutorials:</h3>
+<h3>This is an example of a REST API with ASP.NET Core v1.0, which is made used following tutorials:</h3>
 <ul>
   <li>Channel9: Creating REST API with ASP.NET Core (german): https://www.microsoft.com/germany/techwiese/know-how/video.aspx?id=msdn_de_67138</li>
   <li>Managing Static Files in ASP.NET Core: https://www.youtube.com/watch?v=n3rL0ekYEOM</li>