Update README.md to round-2

Update readme to reflect the version of this code.

Author: mkannwischer

README.md

@@ -1,11 +1,7 @@
 # MAYO-M4
 Arm Cortex-M4 implementation of [MAYO](https://pqmayo.org/).
-
-This repository includes the Arm Cortex-M4 implementations as described in the paper **Nibbling MAYO: Optimized Implementations for AVX2 and Cortex-M4** available [here](https://eprint.iacr.org/2023/1683.pdf).
-
-It consists of two variants:
-1. A slower version compatible with the round-1 specification of MAYO using bitsliced representation. This version is contained in the [main branch](https://github.com/PQCMayo/MAYO-M4/tree/main) of this repository.
-2. A faster version that changes representation of keys and PRNG output to nibble-sliced representation compatible with the [nibbling-mayo branch](https://github.com/PQCMayo/MAYO-C/tree/nibbling-mayo) of the reference implementation. This version is contained in the [nibbling-mayo branch](https://github.com/PQCMayo/MAYO-M4/tree/nibbling-mayo) of this repository.
+The code in this repository implements the Round-2 version of the MAYO specification.
+It is based on the nibble-sliced implementation as described in the paper **Nibbling MAYO: Optimized Implementations for AVX2 and Cortex-M4** available [here](https://eprint.iacr.org/2023/1683.pdf), but with adapted parameters.
 
 This repository is based on [pqm4](https://github.com/mupq/pqm4) and you will find the usual `test.py`, `testvectors.py`, and `benchmarks.py` scripts. 
 Please follow the installation steps in pqm4. 
@@ -16,7 +12,7 @@ git clone --recurse-submodules https://github.com/PQCMayo/MAYO-M4.git
 cd MAYO-M4
 ```
 
-## Running tests and benchmarks for round-1 MAYO
+## Running tests and benchmarks
 ```
 # run tests using qemu
 ./test.py -p mps2-an386 mayo1 mayo2 mayo3
@@ -32,23 +28,3 @@ cd MAYO-M4
 # print benchmarks
 ./convert_benchmarks.py md
 ```
-
-## Running tests and benchmarks for nibble-sliced MAYO
-```
-# switch to nibbling-mayo branch including dependencies
-git checkout nibbling-mayo --recurse-submodules
-
-# run tests using qemu
-./test.py -p mps2-an386 mayo1 mayo2 mayo3
-# run testvectors using qemu
-./testvectors.py -p mps2-an386 mayo1 mayo2 mayo3
-
-# run tests on the board
-./test.py -p nucleo-l4r5zi -u /dev/ttyACM0 mayo1 mayo2 mayo3
-# run testvectors on the board
-./testvectors.py -p nucleo-l4r5zi -u /dev/ttyACM0 mayo1 mayo2 mayo3
-# run benchmarks on the board
-./benchmarks.py -p nucleo-l4r5zi -u /dev/ttyACM0 mayo1 mayo2 mayo3 -i 10
-# print benchmarks
-./convert_benchmarks.py md
-```