nuspec fixed

Author: honfika

src/Titanium.Web.Proxy/Titanium.Web.Proxy.nuspec

@@ -29,7 +29,6 @@
     </dependencies>
   </metadata>
   <files>
-    <file src="bin\$configuration$\net461\Titanium.Web.Proxy.dll" target="lib\net461"  />
     <file src="bin\$configuration$\netstandard2.0\Titanium.Web.Proxy.dll" target="lib\netstandard2.0"  />
     <file src="bin\$configuration$\netcoreapp2.1\Titanium.Web.Proxy.dll" target="lib\netcoreapp2.1"  />
   </files>