Updated SharedAssemblyInfo to v0.20.0

Author: grumpydev

src/SharedAssemblyInfo.cs

@@ -6,5 +6,5 @@
 [assembly: AssemblyCompany("Nancy")]
 [assembly: AssemblyProduct("Nancy")]
 [assembly: AssemblyCopyright("Copyright (C) Andreas Hakansson, Steven Robbins and contributors")]
-[assembly: AssemblyVersion("0.18.0")]
-[assembly: AssemblyInformationalVersion("0.18.0")]
+[assembly: AssemblyVersion("0.20.0")]
+[assembly: AssemblyInformationalVersion("0.20.0")]