remove dud NUnit.Runners package refereence

Author: dsyme

packages.config

@@ -2,7 +2,6 @@
 <packages>
   <package id="FSharp.Data" version="2.2.5" />
   <package id="FsCheck" version="2.0.3" />
-  <package id="NUnit.Runners" version="3.0.0" targetFramework="net45" />
   <package id="FSharp.Compiler.Tools" version="4.0.1.3" />
   <package id="NUnit" version="3.0.0" targetFramework="net45" />
   <package id="NUnit.Console" version="3.0.0" targetFramework="net45" />