Fixed bug with abstract seed selectors

[anty-filidor]

No description provided.

[codecov]

Codecov Report

Merging #44 (9144adb) into master (4aa99e3) will increase coverage by 0.06%.
Report is 1 commits behind head on master.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
+ Coverage   64.64%   64.71%   +0.06%     
==========================================
  Files          36       36              
  Lines        1816     1828      +12     
==========================================
+ Hits         1174     1183       +9     
- Misses        642      645       +3     

Files Changed	Coverage Δ
network_diffusion/seeding/betweenness_selector.py	66.66% <80.00%> (+2.38%)	⬆️
network_diffusion/seeding/closeness_selector.py	68.42% <80.00%> (+1.75%)	⬆️
network_diffusion/seeding/katz_selector.py	68.42% <80.00%> (+1.75%)	⬆️
network_diffusion/__init__.py	100.00% <100.00%> (ø)

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