Improving covr + fixing tests

[codecov[bot]]

Codecov Report

Merging #132 into master will increase coverage by 2.33%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
+ Coverage   95.30%   97.64%   +2.33%     
==========================================
  Files          15       15              
  Lines         469      467       -2     
==========================================
+ Hits          447      456       +9     
+ Misses         22       11      -11     

Impacted Files	Coverage Δ
R/gps_as_sflinestring.R	96.15% <100.00%> (ø)
R/mod_updates.R	94.64% <100.00%> (+3.26%)	:arrow_up:
R/filter_gtfs.R	98.42% <0.00%> (+0.78%)	:arrow_up:
R/gtfs2gps.R	100.00% <0.00%> (+8.42%)	:arrow_up:

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[rafapereirabr]

thanks !