Update README.rst to say RMG-Java is deprecated and link to RMG-Py
Update README.rst to say RMG-Java is deprecated and link to RMG-Py


ReactionMechanismGenerator/RMG-Java,connie/RMG-Java,ReactionMechanismGenerator/RMG-Java,ReactionMechanismGenerator/RMG-Java,connie/RMG-Java,connie/RMG-Java,connie/RMG-Java,ReactionMechanismGenerator/RMG-Java,connie/RMG-Java,ReactionMechanismGenerator/RMG-Java