vivo 0.2.0

• added global_variable_importance()
• added new possibilities in plot() function
• remove dplyr dependence

vivo 0.1.2

• fix in plot() function, change in DALEX package
• small fixes to local_variable_importance()

vivo 0.1.1

• fix in calculate_weight(), change in ingredients package
• add function calculate_variable_split()

vivo 0.1.0

• added tests