Update README.md

README.md

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 Molecule_rxn is a python package used for generating possible intermediates from molecules in a recursive and brute-force way. SMILES notation can be generated from ASE trajectory file and graph representation. EC_fp enables cutomized variants for atoms in Morgan Fingerprinting.
 
 ## Installation
-- Create conda environment and install `RDkit`: `conda create -n molecule_rxn -c rdkit/label/beta rdkit`
+- Create conda environment and install `RDkit`: `conda create -n molecule_rxn -c rdkit/label/beta rdkit python=3.6`
 - Activate conda environment: `conda activate molecule_rxn`
 - Install dependencies:
   - imolecule: `pip install imolecule`
   - networkx: `pip install networkx`
   - ASE: `pip install --upgrade --user ase`
+  - Open Babel: `conda install -c conda-forge openbabel`
 - Install `molecule_rxn`: `pip install git+https://github.com/cchang373/molecule_rxn.git`
 
 ## Usage