Chore: 1.9.0

# [1.9.0](https://git.rwth-aachen.de/coscine/api/sts/compare/v1.8.1...v1.9.0) (2020-02-17)

### New

* Implement Logout Handling (coscine/issues#629) ([6b7d391f](https://git.rwth-aachen.de/coscine/api/sts/commit/6b7d391f6c8afcc4e535f10c9aab78de569676b4)), closes [coscine/issues#629](https://git.rwth-aachen.de/coscine/issues/issues/629)

src/STS/Properties/AssemblyInfo.cs

@@ -9,8 +9,8 @@ using System.Reflection;
 [assembly: AssemblyDescription("STS is a part of the CoScInE group.")]
 [assembly: AssemblyCompany("IT Center, RWTH Aachen University")]
 [assembly: AssemblyProduct("STS")]
-[assembly: AssemblyVersion("1.8.1.0")]
-[assembly: AssemblyFileVersion("1.8.1.0")]
-[assembly: AssemblyInformationalVersion("1.8.1.0")]
+[assembly: AssemblyVersion("1.9.0.0")]
+[assembly: AssemblyFileVersion("1.9.0.0")]
+[assembly: AssemblyInformationalVersion("1.9.0.0")]
 [assembly: AssemblyCopyright("2020 IT Center, RWTH Aachen University")]