"DISTANCE", "SERVICE_TIME"

[chkwon]

To handle CMT6 and CMT7 instances

[codecov]

Codecov Report

Merging #6 (cacf9b1) into master (042e17a) will increase coverage by 2.06%.
The diff coverage is 90.47%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   91.26%   93.33%   +2.06%     
==========================================
  Files           4        4              
  Lines         126      120       -6     
==========================================
- Hits          115      112       -3     
+ Misses         11        8       -3     

Impacted Files	Coverage Δ
src/reader.jl	89.47% <84.61%> (+2.51%)	⬆️
src/CVRPLIB.jl	100.00% <100.00%> (ø)
src/writer.jl	97.50% <100.00%> (+0.44%)	⬆️

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