Updated nuspec to state dependency on Autofac v3.5.2

Author: GiuseppePiscopo

AutofacContrib.NSubstitute/AutofacContrib.NSubstitute.nuspec

@@ -30,7 +30,7 @@
     </language>
     <dependencies>
        <dependency id="NSubstitute" version="1.8.2.0" />
-       <dependency id="Autofac" version="3.3.0" />
+       <dependency id="Autofac" version="3.5.2" />
     </dependencies>
   </metadata>
   <files>