code: function Rotation (config) {
    this.realmUrl = config.realmUrl;
    this.minTimeBetweenJwksRequests = config.minTimeBetweenJwksRequests;
    this.jwks = [];
    this.lastTimeRequesTime = 0;
  }
docs: Construct a Rotation instance
  
  @param {Config} config Config object.
  
  @constructor