fix alias for get-installedpsresource

Author: alerickson

src/code/GetInstalledPSResource.cs

@@ -15,8 +15,7 @@ namespace Microsoft.PowerShell.PSResourceGet.Cmdlets
     /// Returns a single resource or multiple resource.
     /// </summary>
     [Cmdlet(VerbsCommon.Get, "InstalledPSResource")]
-    [Alias("Get-PSResource")]
-    [Alias("gres")]
+    [Alias("Get-PSResource", "gres")]
     [OutputType(typeof(PSResourceInfo))]
     public sealed class GetInstalledPSResourceCommand : PSCmdlet
     {