added Na and Ca counterions to charge carboxyl goups

added charged carboxyl groups

ReadLammpsData inherits from Sim

charge imbalance is now a warning

remove print statments from charge param

add validate func to sim (lost in merge...)

assign charges in param file

Merge branch 'master' of https://github.com/velocirobbie/make-graphitics

Update README.md

python black enforced changes

Update README.md

update README

env file name change

conda env name change

fix example output name