Fix libvmaf.a link in README.md

BUG=aomedia:2688

Change-Id: I40e2e7f1f2b2c98c2cc5cd55dc8a1e5680a17f53
diff --git a/README.md b/README.md
index c0fa329..a458f52 100644
--- a/README.md
+++ b/README.md
@@ -318,7 +318,7 @@
 ### Build with VMAF support {#build-with-vmaf}
 
 After installing
-[libvmaf.a](https://github.com/Netflix/vmaf/blob/master/resource/doc/libvmaf.md),
+[libvmaf.a](https://github.com/Netflix/vmaf/tree/master/libvmaf),
 you can use it with the encoder:
 
 ~~~