Fix the test suite (or rather, the code) for Python 3

[asergi]

No description provided.

[codecov-io]

Codecov Report

Merging #35 into master will decrease coverage by -0.17%.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
- Coverage   85.83%   85.66%   -0.17%     
==========================================
  Files          15       15              
  Lines        1221     1221              
==========================================
- Hits         1048     1046       -2     
- Misses        173      175       +2

Impacted Files	Coverage Δ
pcapfile/protocols/network/ip.py	79.12% <ø> (ø)	✅
pcapfile/test/protocols_transport_tcp.py	90% <100%> (ø)	✅
pcapfile/protocols/linklayer/wifi.py	86.08% <100%> (-0.35%)	❌
pcapfile/protocols/transport/tcp.py	71.79% <50%> (ø)	✅

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[asergi]

Unfortunately, 69d970a breaks Python 3 again 😞

[asergi]

Fixed in 106b33f.