Update packages.config

Author: Maddie Clayton

src/Authentication.Abstractions/packages.config

@@ -8,7 +8,7 @@
   <package id="Microsoft.Bcl.Async" version="1.0.168" targetFramework="net40" />
   <package id="Microsoft.IdentityModel.Clients.ActiveDirectory" version="2.28.3" targetFramework="net45" />
   <package id="Microsoft.Net.Http" version="2.2.28" targetFramework="net45" />
-  <package id="Microsoft.Rest.ClientRuntime" version="2.3.18" targetFramework="net452" />
+  <package id="Microsoft.Rest.ClientRuntime" version="2.3.18" targetFramework="net452"/>
   <package id="Microsoft.Rest.ClientRuntime.Azure" version="3.3.18" targetFramework="net452" />
   <package id="Microsoft.Rest.ClientRuntime.Azure.Authentication" version="2.3.1" targetFramework="net452" />
   <package id="Microsoft.WindowsAzure.ConfigurationManager" version="3.2.0" targetFramework="net45" />
@@ -33,4 +33,4 @@
   <package id="xunit.extensibility.core" version="2.1.0" targetFramework="net45" />
   <package id="xunit.extensibility.execution" version="2.1.0" targetFramework="net45" />
   <package id="xunit.runner.visualstudio" version="2.1.0" targetFramework="net45" developmentDependency="true" />
-</packages>
+</packages>