fix default registry in restore command

Author: 0xF6

src/cmd/RestoreCommand.cs

@@ -33,7 +33,7 @@ internal override CommandLineApplication Setup()
 
         public async Task<int> Execute(CommandOption registryOption)
         {
-            var registry = registryOption.HasValue() ? registryOption.Value() : "github+https://github.com/ancientproject";
+            var registry = registryOption.HasValue() ? registryOption.Value() : "runic";
             var dir = Directory.GetCurrentDirectory();
             if (!this.Validate(dir))
                 return 1;