Disable coverage reporting as it's unused #262

Job	Run time
Version Bump 🤜🤛	0s
Get R version	1s
Links / Validate Links	3s
Check / (release)	2m 55s
Check / (devel)	42s
Check / (oldrel)	3m 14s
Documentation	0s
Validation	0s
Code Style / Code Style	53s
Spelling / Spellcheck	51s
Code Coverage / Test Coverage	1m 17s
Lint / Lint	59s
Man Pages / Roxygen	57s
Check Templates / Verify	1m 4s
Code Coverage / Generate badge for coverage	3s
	12m 59s

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