fix: protocol not protocol-units

Author: l-monninger

README.md

@@ -30,7 +30,7 @@ Please see the [CONTRIBUTING.md](CONTRIBUTING.md) file for contribution guidelin
 ## Organization
 There are five subdirectories which progressively build on one another for node logic.
 
-1. [`util`](./util): contains utility logic mainly reused in [`protocol-units`](./protocol-units).
+1. [`util`](./util): contains utility logic mainly reused in [`protocol`](./protocol).
 2. [`protocol`](./protocol): contains implementations of the protocol logic. 
 3. [`node`](./node): contains single-process runnable binaries that aggregate the protocol logic.
 4. [`network`](./network): contains logic for running multiple nodes in a network.