Updated support's packages version

nuget/AppCenterPush.nuspec

@@ -22,15 +22,15 @@
         <dependency id="Microsoft.AppCenter" version="$version$" />
         <dependency id="Xamarin.Firebase.Messaging" version="60.1142.1" />
 
-        <!-- 
+        <!--
           We get conflicts between Forms and Messaging if we don't resolve those packages explicitly.
           Remove any of these and it will not install in Demo app... This is really the minimal set.
         -->
-        <dependency id="Xamarin.Android.Support.Compat" version="26.0.2" />
-        <dependency id="Xamarin.Android.Support.Design" version="26.0.2" />
-        <dependency id="Xamarin.Android.Support.v4" version="26.0.2" />
-        <dependency id="Xamarin.Android.Support.v7.CardView" version="26.0.2" />
-        <dependency id="Xamarin.Android.Support.v7.MediaRouter" version="26.0.2" />
+        <dependency id="Xamarin.Android.Support.Compat" version="28.0.0.1" />
+        <dependency id="Xamarin.Android.Support.Design" version="28.0.0.1" />
+        <dependency id="Xamarin.Android.Support.v4" version="28.0.0.1" />
+        <dependency id="Xamarin.Android.Support.v7.CardView" version="28.0.0.1" />
+        <dependency id="Xamarin.Android.Support.v7.MediaRouter" version="28.0.0.1" />
       </group>
     </dependencies>
     <version>$version$</version>