def min(item, min)
      data = read_file
      match_name(item)
      data[@@item]["min"] = min.to_i
      write_file(data)
    end
def min(item, min)
      data = read_file
      match_name(item)
      data[@@item]["min"] = min.to_i
      write_file(data)
    end
Set minimum acceptable amount of existing inventory item
 @param item [String] item to update
 @param min [String] acceptable minimum amount of item to always have on hand