code: public Formation scale(String appName, String processType, int quantity) {
          return connection.execute(new FormationUpdate(appName, processType, quantity), apiKey);
      }
docs: Scales a process type
  
  @param appName See {@link #listApps} for a list of apps that can be used.
  @param processType type of process to maintain
  @param quantity number of processes to maintain