Update assembly info file for v1.0.3 [skip ci]

[version update]

Author: nfbot

source/nanoFramework.CoreLibrary/System/AssemblyInfo2.cs

@@ -12,6 +12,6 @@
 [assembly: AssemblyCompany("nanoFramework Contributors")]
 [assembly: AssemblyProduct("nanoFramework mscorlib")]
 [assembly: AssemblyCopyright("Copyright © nanoFramework Contributors 2017")]
-[assembly: AssemblyVersion("1.0.2.0")]
-[assembly: AssemblyFileVersion("1.0.2.0")]
-[assembly: AssemblyInformationalVersion("1.0.2")]
+[assembly: AssemblyVersion("1.0.3.0")]
+[assembly: AssemblyFileVersion("1.0.3.0")]
+[assembly: AssemblyInformationalVersion("1.0.3")]