rm_citation2 may not handle apostrophe based citations

[trinker]

see: https://www.debuggex.com/r/-mWUpyip8B96_Fc7

If needed it might work to do one optionally right before the data parenthesis.

[trinker]

As suspected:

rm_citation(
    c("I want to see Henery's (1988) old one",
    "I saw Henery et al.'s (1999, 2004b) show",
    "I saw Henery & Sau's (1999) time")
, extract=TRUE)

## [[1]]
## [1] "Henery's (1988)"
## 
## [[2]]
## [1] NA
## 
## [[3]]
## [1] NA

[trinker]

Fixed