Change default OutputMode to none.

Bug: 29869799
Change-Id: I6b2f58ec8b9d49cda73fe59a4e6a40df84a877b5
diff --git a/README.android b/README.android
index 6df57d1..cad30c6 100644
--- a/README.android
+++ b/README.android
@@ -13,3 +13,4 @@
 is the list of the changes:
 
 1) Remove the creation of JmxRegistration in org.jacoco.agent.rt.internal.Agent.
+2) Change default OutputMode to none in org.jacoco.core.runtime.AgentOptions