Add service-mod branch to README

README.md

@@ -1,10 +1,8 @@
 # ARCore for All
 Google ARCore for "unsupported" Android devices
 
-## Help Wanted
-**If you have a Google Tango device**, please post your device's `online-calibration.xml` or `calibration.xml`. This would help a great deal in ongoing research to make ARCore work on more devices.
-
-Please see [this issue](https://github.com/tomthecarrot/arcore-for-all/issues/28#issuecomment-326646191) for more info. Thanks!
+## Update
+**Please check out the [service mod](https://github.com/tomthecarrot/arcore-for-all/tree/service-mod) branch** to help us develop the latest experiment to bring ARCore to more devices. Thanks!
 
 ## Summary
 Google's ARCore developer preview for Android is awesome. Unfortunately, my Android phone (Samsung GS8+) is not on the supported list, and apps built with ARCore exit at start on my device. However, its hardware actually can run ARCore!