Use {tzdb} (#181)

* Swap to tzdb data

* Remove current `tzdata/`

* Swap from DavisVaughan to r-lib

Author: DavisVaughan

DESCRIPTION

@@ -27,6 +27,7 @@ Depends:
 Imports: 
     ellipsis,
     rlang,
+    tzdb,
     vctrs (>= 0.3.6.9000)
 Suggests: 
     covr,
@@ -41,6 +42,7 @@ LinkingTo:
 VignetteBuilder: 
     knitr
 Remotes:
+    r-lib/tzdb,
     r-lib/vctrs
 Config/testthat/edition: 3
 Encoding: UTF-8

R/zzz.R

@@ -3,7 +3,7 @@
 .onLoad <- function(libname, pkgname) {
   clock_init_utils()
 
-  tzdata <- system.file("tzdata", package = "clock", mustWork = TRUE)
+  tzdata <- tzdb::tzdb_path(type = "text")
   clock_set_install(tzdata)
 
   vctrs::s3_register("pillar::pillar_shaft", "clock_calendar", pillar_shaft.clock_calendar)