Fix Subdivisions & States in README
Fix Subdivisions & States in README

`Country#subdivisions` and `Country#states` returns an array of hashes with string keys, not symbols.
hexorx/countries,charitywater/countries,touristly/countries,aminin/countries,JuanitoFatas/countries,ohenrik/countries,tenforwardconsulting/countries,GUI/countries,thieunus/countries,burningpony/countries