LMM#bootstrap and LMM#fix_ef_conf_int can now be run single-threaded, using the new method argument parallel
LMM#bootstrap and LMM#fix_ef_conf_int can now be run single-threaded,
using the new method argument parallel

pjotrp/mixed_models,pjotrp/mixed_models,agisga/mixed_models,agisga/mixed_models,pjotrp/mixed_models