Update config.json

Author: moljac

config.json

@@ -1572,6 +1572,14 @@
         "dependencyOnly": false,
         "templateSet": "guava"
       },
+      {
+        "groupId": "com.google.guava",
+        "artifactId": "guava",
+        "version": "29.0-android",
+        "nugetVersion": "29.0.0",
+        "nugetId": "Xamarin.Google.Guava",
+        "dependencyOnly": true
+      },
       {
         "groupId": "com.google.guava",
         "artifactId": "listenablefuture",