Update README installation instructions [ci skip]

README.md

@@ -13,13 +13,13 @@ a3fe
 
 ### Installation
 
-a3fe depends on SLURM for scheduling jobs, and on GROMACS for running initial equilibration simulations. Please ensure that your have sourced your GMXRC or loaded your GROMACS module before proceeding with the installation.
+a3fe depends on SLURM for scheduling jobs, and on GROMACS for running initial equilibration simulations. Please ensure that your have sourced your GMXRC or loaded your GROMACS module before proceeding with the installation. While we recommend installing with [mamba](https://mamba.readthedocs.io/en/latest/installation/mamba-installation.html), you can substitute `mamba` with `conda` in the following commands.
 
 Now, download and install a3fe:
 ```bash
 git clone https://github.com/michellab/a3fe.git
 cd a3fe
-mamba mamba env create -f environment.yml
+mamba env create -f environment.yml
 python -m pip install --no-deps .
 ```