Conda environment instructions do not work anymore

[claudiodsf]

The instructions in README.md for creating a conda environment do not work anymore on my Mac (at least).

The following creates a working environment for me, with tensorflow 2.4 (which should work, according to #9):

   conda create -n phaseworm -c defaults -c conda-forge python=3.8 tensorflow=2.4 obspy

phaseworm launches (all the dependencies are installed), but I couldn't test the code yet with an example.