Raise when depot section does not end with -1

[leonlan]

Closes #70.

[codecov]

Codecov Report

Base: 96.61% // Head: 96.56% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (54b9dee) compared to base (f8aacbf).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
- Coverage   96.61%   96.56%   -0.05%     
==========================================
  Files          16       16              
  Lines         236      233       -3     
==========================================
- Hits          228      225       -3     
  Misses          8        8              

Impacted Files	Coverage Δ
vrplib/parse/parse_vrplib.py	96.55% <100.00%> (+0.12%)	⬆️
vrplib/parse/parse_distances.py	90.00% <0.00%> (-0.91%)	⬇️

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