Updated README to point to binary releases

AndroidLibrary/README.md

@@ -52,7 +52,7 @@ NOTE: may change after Go 1.4 is released.
 Using
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-1. Build from source or use the [provided shared object binary](TODO: link to release) and Java source files
+1. Build the shared object library from source or use the [binary release](https://github.com/Psiphon-Labs/psiphon-tunnel-core/releases) and Java source files
 1. Add Go/Java integration files `java_golang/go/*.java` to your `$src/go`
 1. Add `java_psi/go/psi/Psi.java` to your `$src/go/psi`
 1. Add `libgojni.so` to your Android app