address CRAN feedback #602

Job	Run time
Get R version	1s
Check / (4.1)	3m 59s
Links / Validate Links	4s
Check / (4.2)	5m 37s
Check / (4.3)	5m 16s
Check / (devel)	5m 23s
Documentation	0s
Validation	0s
Man Pages / Roxygen	3m 31s
Lint / Lint	3m 41s
Code Coverage / Test Coverage	3m 54s
Spelling / Spellcheck	3m 17s
Check Templates / Verify	3m 30s
Code Style / Code Style	3m 19s
Code Coverage / Generate badge for coverage	4s
	41m 36s

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