Changes in version 0.1.1                        

  - in simulate_hindex(): implemented functionality for considering
    seniority of scientists during initialization (parameter init_type)
  - in simulate_hindex(): implemented functionality to consider
    subgroups of scientists (and corresponding options, s. docs)
  - in simulate_hindex(): calculate number of top-10% papers
  - in plot_hsim(): implemented functionality to plot top-10% papers
  - in setup_simulation(): return initial age of scientists
  - in simulate_hindex(): calculate mindex
  - in plot_hsim(): implemented functionality to plot mindex
  - in plot_hsim(): visualize subgroups

                 Changes in version 0.1.0 (2019-07-12)                  

  - h-index and h-alpha values can be generated by simulate_hindex() and
    visualized by plot_hsim()