Update Owin to latest (#257)

Author: mikeharder

build/dependencies.props

@@ -9,7 +9,7 @@
     <NETStandardImplicitPackageVersion>2.0.0-*</NETStandardImplicitPackageVersion>
     <RuntimeFrameworkVersion Condition="'$(TargetFramework)'=='netcoreapp2.0'">2.0.0-*</RuntimeFrameworkVersion>
     <NowinVersion>0.11.0</NowinVersion>
-    <OwinVersion>3.0.1</OwinVersion>
+    <OwinVersion>3.1.0</OwinVersion>
     <TestSdkVersion>15.3.0-*</TestSdkVersion>
     <XunitVersion>2.3.0-beta2-*</XunitVersion>
   </PropertyGroup>