Bump AssemblyNativeVersion to 100.2.3.0 (#90)

***NO_CI***

Author: josesimoes

source/nanoFramework.CoreLibrary/System/AssemblyInfo.cs

@@ -14,4 +14,4 @@
 [assembly: AssemblyProduct("nanoFramework mscorlib")]
 [assembly: AssemblyCopyright("Copyright © nanoFramework Contributors 2017")]
 
-[assembly: AssemblyNativeVersion("100.2.2.0")]
+[assembly: AssemblyNativeVersion("100.2.3.0")]