PAS90: LastSeenAt column should be empty in users list when user has no active credentials (#10)

* LastUsedAt should be nullable on PasswordlessUserSummary as there is no guarantee they have credentials

* Bump version to 0.0.13

Author: jonashendrickx

src/Sdk/Models/PasswordlessUserSummary.cs

@@ -6,5 +6,5 @@ public class PasswordlessUserSummary
     public List<string> Aliases { get; set; }
     public int CredentialsCount { get; set; }
     public int AliasCount { get; set; }
-    public DateTime LastUsedAt { get; set; }
+    public DateTime? LastUsedAt { get; set; }
 }

src/Sdk/Sdk.csproj

@@ -14,6 +14,7 @@
     <RepositoryUrl>https://github.com/passwordless/passwordless-dotnet</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
     <PackageReadmeFile>README.md</PackageReadmeFile>
+    <Version>0.0.13</Version>
   </PropertyGroup>
 
   <ItemGroup>