Bump minimum R version to 3.4

Author: DavisVaughan

DESCRIPTION

@@ -18,7 +18,7 @@ License: MIT + file LICENSE
 URL: https://clock.r-lib.org, https://github.com/r-lib/clock
 BugReports: https://github.com/r-lib/clock/issues
 Depends: 
-    R (>= 3.3)
+    R (>= 3.4)
 Imports:
     rlang (>= 1.0.4),
     tzdb (>= 0.3.0),

NEWS.md

@@ -1,5 +1,8 @@
 # clock (development version)
 
+* R >=3.4.0 is now required. This is consistent with the standards of the
+  tidyverse.
+
 * Bumped required minimum version of tzdb to 0.3.0 to get access to the latest
   time zone database information (2022a).