Update README.md

Author: paulheinr

README.md

@@ -94,12 +94,12 @@ module load anaconda3/2023.09
 conda init bash
 ```
 
-Then create your own environment and install `libclang`:
+Then create your own environment and install `libclang` and `llvmdev`:
 
 ```shell
 conda create -n your_env_name
 conda activate your_env_name
-conda install libclang 
+conda install libclang llvmdev
 ```
 
 ##### Load dependencies
@@ -153,4 +153,4 @@ You need to create protobuf files from the xml files. This can be done with the
 
 ```shell
 cargo run --bin convert_to_binary --release -- --network network.xml --population population.xml --vehicles vehicles.xml --output-dir output --run-id run
-```
+```