Update README.md

Author: cybergalactic

README.md

@@ -49,9 +49,7 @@ where ```<path>``` is the path of the downloaded PythonVehicleSimulator reposito
 
 1. Click on the green code tab on Github and choose download
 2. This gives you the catalog: PythonVehicleSimulator-master (can be renamed)
-3. ```python3 -m pip install /MY_PATH/PythonVehicleSimulator-master```
+3. ```python3 -m pip install -e /MY_PATH/PythonVehicleSimulator-master```
 
 ### Development:
-To change and update the files, you need to install with the ```e``` option:
-1. Clone the repository.
-2. ```python3 -m pip install -e <path>```
+Note that the -e option is needed to update and change the files. If omitted, you can only run the program.