README.md: Update to recommend running unit tests with -c opt.

- This is not strictly necessary. It provides a better default experience by keeping the cache from the previous steps. PiperOrigin-RevId: 628075126
AOMediaCodec · Apr 25, 2024 · 362cb87 · 362cb87
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diff --git a/README.md b/README.md
@@ -59,7 +59,7 @@ bazel build -c opt //iamf/cli:encoder_main
 Running built-in tests:
 
 ```
-bazel test //iamf/...
+bazel test -c opt //iamf/...
 ```
 
 #### Using the encoder with proto input