vlad 0.2.0

Changes

Renamed functions:
```
    original name | new name
```
:———————–|:————- cusum_arl_h_sim() | bcusum_crit_sim() cusum_arl_sim() | bcusum_arl_sim() eocusum_arl_h_sim() | eocusum_crit_sim() eocusum_adoc_sim() | eocusum_ad_sim() racusum_arl_h_sim() | racusum_crit_sim() racusum_adoc_sim() | racusum_ad_sim()

Include Markov Chain approximation for risk-adjusted CUSUM chart based on log-likelihood ratio statistic in function racusum_arl_mc() and racusum_crit_mc()
Add option of calculation of optimal k based on mean outcome in function optimal_k()
Add function for calculation of CUSUM scores for log-likelihood ratio CUSUM llr_cusum_scores() and E-O CUSUM eo_cusum_scores()
Extend unit tests for functions