Add link to zarr zenodo spec and cran friendly tests

DESCRIPTION

@@ -16,8 +16,9 @@ Authors@R: c(
            email = "dblodgett@usgs.gov",
            comment = c(ORCID = "0000-0001-9489-1710"))
   )
-Description: An implementation of chunked, compressed,
-    N-dimensional arrays for R.
+Description: An implementation of chunked, compressed, 
+  N-dimensional arrays for R. Zarr spec V2 (2024) 
+  <doi:10.5281/zenodo.11320255>.
 License: MIT + file LICENSE
 BugReports: https://github.com/keller-mark/pizzarr/issues
 URL: https://github.com/keller-mark/pizzarr

tests/testthat/test-01-parallel.R

@@ -66,10 +66,9 @@ run_parallel_set <- function(num_workers) {
 }
 
 test_that("can run get_item() in parallel", {
-  skip_on_cran()
   bench_df <- bench::mark(
+    run_parallel_get(1),
     run_parallel_get(2),
-    run_parallel_get(4),
     iterations = 1,
     memory = FALSE,
     filter_gc = FALSE
@@ -81,8 +80,8 @@ test_that("can run get_item() in parallel", {
 
 test_that("can run set_item() in parallel", {
   bench_df <- bench::mark(
+    run_parallel_set(1),
     run_parallel_set(2),
-    run_parallel_set(4),
     iterations = 1,
     memory = FALSE,
     filter_gc = FALSE