code: function makeRegistryItems(rulesConfig) {
      return Object.keys(rulesConfig).reduce((accumulator, ruleId) => {
          accumulator[ruleId] = rulesConfig[ruleId].map(config => ({
              config,
              specificity: config.length || 1,
              errorCount: void 0
          }));
          return accumulator;
      }, {});
  }
docs: This callback is used to measure execution status in a progress bar
  @callback progressCallback
  @param {number} The total number of times the callback will be called.
   
  Create registryItems for rules
  @param   {rulesConfig} rulesConfig Hash of rule names and arrays of ruleConfig items
  @returns {Object}                  registryItems for each rule in provided rulesConfig