Minor tweaks for CRAN compliance

[stevecondylios]

An error (to do with retrieving badges used in markdown) is avoided by not including the markdown files in the tarball sent to CRAN.

speedtest now passes check --as-cran

speedtest should now pass

[codecov]

Codecov Report

Merging #7 into master will increase coverage by 1.2%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master       #7     +/-   ##
=========================================
+ Coverage   12.56%   13.77%   +1.2%     
=========================================
  Files           9        9             
  Lines         183      167     -16     
=========================================
  Hits           23       23             
+ Misses        160      144     -16

Impacted Files	Coverage Δ
R/bestest.r	0% <0%> (ø)	⬆️
R/test-main.r	0% <0%> (ø)	⬆️
R/download.r	0% <0%> (ø)	⬆️
R/servers.r	0% <0%> (ø)	⬆️
R/upload.r	0% <0%> (ø)	⬆️
R/util.r	20.83% <0%> (+2.97%)	⬆️

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[hrbrmstr]

#ty! Pls add yourself to the DESCRIPTION file as a contributor and I can merge after that. FWIW this wasn't the cause of CRAN pain. One of the folks there just doesn't like console output when it doesn't come from RStudio funded authors.