Fix missed version from reverted commit

config.json

@@ -115,7 +115,7 @@
 			"groupId" : "com.android.support",
 			"artifactId" : "coordinatorlayout",
 			"version" : "28.0.0",
-			"nugetVersion" : "28.0.0-preview8",
+			"nugetVersion" : "28.0.0-preview9",
 			"nugetId" : "Xamarin.Android.Support.CoordinaterLayout"
 		},
 		{