yn_to_tf: additional fix needed

[esimms999-gsk]

Left is "main" branch, right is "dev" branch. The change was made to address Issue #47 .

There needs to be an additional, small change made to the regex:

if(all(is.na(x) | str_detect(x, regex("^y$|^n$|yes$|no$", ignore_case = T)))){
case_when(str_detect(x, regex("^y$|yes$", ignore_case = T)) ~ TRUE,
str_detect(x, regex("^n$|no$", ignore_case = T)) ~ FALSE,

"ABCy" would be set to NA. But "ABCyes" would be set to TRUE. Same with "ABCn" vs "ABCno" being set to NA vs FALSE.

[esimms999-gsk]

Created fork and PR #59 with modification to yn_to_tf in dev branch.

[mstackhouse]

Merged in #59 to dev