Upgrade to xunit 2.3.0-beta4

Author: Nate McMaster

build/dependencies.props

@@ -8,8 +8,8 @@
     <NETStandardImplicitPackageVersion>2.0.0-*</NETStandardImplicitPackageVersion>
     <NETStandardLibraryNETFrameworkVersion>2.0.0-*</NETStandardLibraryNETFrameworkVersion>
     <RuntimeFrameworkVersion Condition="'$(TargetFramework)'=='netcoreapp2.0'">2.0.0-*</RuntimeFrameworkVersion>
-    <TestSdkVersion>15.3.0-*</TestSdkVersion>
+    <TestSdkVersion>15.3.0</TestSdkVersion>
     <XdtVersion>1.4.0</XdtVersion>
-    <XunitVersion>2.3.0-beta2-*</XunitVersion>
+    <XunitVersion>2.3.0-beta4-build3742</XunitVersion>
   </PropertyGroup>
 </Project>