(v1.7.1.9022) rely on vctrs for ab selectors

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: AMR
-Version: 1.7.1.9021
-Date: 2021-07-12
+Version: 1.7.1.9022
+Date: 2021-07-23
 Title: Antimicrobial Resistance Data Analysis
 Authors@R: c(
     person(role = c("aut", "cre"), 
@@ -57,6 +57,7 @@ Suggests:
     skimr,
     tidyr,
     tinytest,
+    vctrs,
     xml2
 VignetteBuilder: knitr,rmarkdown
 URL: https://github.com/msberends/AMR, https://msberends.github.io/AMR