Updated a dependencies of unit tests

Author: Taritsyn

test/JavaScriptEngineSwitcher.Tests/JavaScriptEngineSwitcher.Tests.csproj

@@ -14,7 +14,7 @@
 	<Import Project="../../build/common.props" />
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.6.1" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.7.2" />
 		<PackageReference Include="xunit" Version="2.3.1" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
 		<PackageReference Include="JavaScriptEngineSwitcher.ChakraCore.Native.win8-arm" Version="3.0.0-beta2" />