Merge pull request #2132 from MunGell/minor-json-fix

Minor JSON fix

data.json

@@ -17,7 +17,7 @@
             "link": "https://github.com/MvvmCross/MvvmCross",
             "label": "first-timers-only",
             "technologies": [
-                ".NET"
+                ".NET",
                 "C#"
             ],
             "description": "The .NET MVVM framework for cross-platform solutions, including Xamarin.iOS, Xamarin.Android, Windows and Mac."