Update README.md

README.md

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-This module is a thin Python wrapper library of the [EMC](http://montecarlo.sourceforge.net/emc/Welcome.html) package that allows you to use all EMC functionalities with Python interface.
+This module is a thin Python wrapper library of the [EMC](http://montecarlo.sourceforge.net/emc/Welcome.html) package that allows you to use all EMC functionalities with Python interface. No pre-installation of EMC is needed.
 
 EMC creates input structures from SMILES strings and LAMMPS input files for particle simulations with atomistic force fields - Born, COMPASS, PCFF, CHARMM, OPLS, TraPPE or coarse-grained force fields - DPD, Martini, SDK.