Mention that Oracle program is a pre-compiled binary

Author: tompntn

integration-tests/README.md

@@ -2,7 +2,7 @@
 
 This project provides end-to-end tests for the [Pyth `agent`](../) binary. Each test:
 - Starts an instance of [`solana-test-validator`](https://docs.solana.com/developing/test-validator).
-- Deploys the [Pyth Oracle program](https://github.com/pyth-network/pyth-client/tree/main/program).
+- Deploys the [Pyth Oracle program](https://github.com/pyth-network/pyth-client/tree/main/program). Note that this deploys a [pre-compiled binary](../integration-tests/oracle.so), which should be updated when the Oracle program significantly changes.
 - Creates [Mapping; Product and Price accounts](https://docs.pyth.network/design-overview/account-structure) using the [`program-admin`](https://github.com/pyth-network/program-admin) library.
 - Builds and runs an instance of the Pyth `agent`, configured with the accounts set up in the previous step.
 - Uses the [JRPC Websocket API](https://docs.pyth.network/publish-data/pyth-client-websocket-api) to test publishing to and retrieving data from the network.