chore: Release 0.2.18

[robinlinden]

This change is 

[codecov]

Codecov Report

Merging #2300 (3a5da35) into master (6b0d115) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2300      +/-   ##
==========================================
- Coverage   79.03%   79.02%   -0.01%     
==========================================
  Files         127      127              
  Lines       24021    24021              
==========================================
- Hits        18985    18983       -2     
- Misses       5036     5038       +2     

Impacted Files	Coverage Δ
toxav/bwcontroller.c	38.55% <0.00%> (-7.23%)	⬇️
toxcore/TCP_connection.c	70.31% <0.00%> (-0.29%)	⬇️
toxcore/onion_client.c	90.52% <0.00%> (-0.13%)	⬇️
toxcore/net_crypto.c	87.21% <0.00%> (+0.07%)	⬆️
toxcore/DHT.c	83.64% <0.00%> (+0.07%)	⬆️
toxcore/onion.c	85.79% <0.00%> (+0.28%)	⬆️
toxcore/friend_connection.c	83.95% <0.00%> (+0.93%)	⬆️

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