Updates to fix cran issues identified in #311

[elimillera]

Closes #311

[codecov-commenter]

Codecov Report

Merging #312 (e916212) into master (3060d6a) will increase coverage by 2.62%.
Report is 32 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head e916212 differs from pull request most recent head aabf050. Consider uploading reports for the commit aabf050 to get more accurate results

@@            Coverage Diff             @@
##           master     #312      +/-   ##
==========================================
+ Coverage   59.23%   61.85%   +2.62%     
==========================================
  Files          64       66       +2     
  Lines         991     1025      +34     
==========================================
+ Hits          587      634      +47     
+ Misses        404      391      -13     

Files Changed	Coverage Δ
R/pkg_ref_cache.R	9.09% <ø> (ø)
R/pkg_ref_cache_NEWS_urls.R	18.18% <ø> (ø)
R/pkg_ref_cache_archive_release_date.R	0.00% <ø> (ø)
R/pkg_ref_cache_bug_reports.R	64.70% <ø> (ø)
R/pkg_ref_cache_bug_reports_host.R	100.00% <ø> (ø)
R/pkg_ref_cache_bug_reports_url.R	55.55% <ø> (ø)
R/pkg_ref_cache_covr_coverage.R	100.00% <ø> (ø)
R/pkg_ref_cache_description.R	100.00% <ø> (ø)
R/pkg_ref_cache_downloads.R	100.00% <ø> (ø)
R/pkg_ref_cache_expr_coverage.R	0.00% <ø> (ø)
... and 18 more

... and 1 file with indirect coverage changes

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