ukbtools v0.10.1

Bug fix:

ukb_icd_freq_by: corrected order by levels of reference.var in the optional plot. (order in the default dataframe returned was correct.)

ukb_df: corrected tab file path update in r source file. Specifically, made regular expression more specific (Regular expression matching word elsewhere in the source file.). Also, replaced utils::read.delim with readr::read_tsv for faster read, with progress bar.