Response to rOpenSci reviewers

[Rekyt]

The reviewers assigned by rOpenSci have sent great reviews 🎉
(reviewer 1: ropensci/software-review#285 (comment)
reviewer 2: ropensci/software-review#285 (comment))

The aim of this PR is to answer to reviewers by making the requested changes.

[codecov-io]

Codecov Report

Merging #39 into master will decrease coverage by 0.1%.
The diff coverage is 95.8%.

@@            Coverage Diff             @@
##           master      #39      +/-   ##
==========================================
- Coverage   96.41%   96.31%   -0.11%     
==========================================
  Files           4        4              
  Lines         223      244      +21     
==========================================
+ Hits          215      235      +20     
- Misses          8        9       +1

Impacted Files	Coverage Δ
R/rromeo_journals.R	100% <100%> (ø)	⬆️
R/rromeo_base.R	80% <50%> (-20%)	⬇️
R/rromeo_publishers.R	87.5% <87.87%> (-0.22%)	⬇️
R/utils.R	99.33% <98.78%> (+0.04%)	⬆️

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