Release 0.2.8

[robinlinden]

This change is 

[codecov]

Codecov Report

Merging #1225 into master will increase coverage by <.1%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #1225     +/-   ##
========================================
+ Coverage      83%     83%   +<.1%     
========================================
  Files          82      82             
  Lines       14647   14647             
========================================
+ Hits        12163   12170      +7     
+ Misses       2484    2477      -7

Impacted Files	Coverage Δ
toxav/msi.c	64.8% <0%> (-2%)	⬇️
toxav/toxav.c	68.1% <0%> (-1.2%)	⬇️
toxcore/friend_connection.c	94.5% <0%> (-0.9%)	⬇️
toxcore/net_crypto.c	94.2% <0%> (-0.6%)	⬇️
toxcore/Messenger.c	86.6% <0%> (-0.1%)	⬇️
toxcore/onion_client.c	96.1% <0%> (+0.1%)	⬆️
toxcore/group.c	76.4% <0%> (+0.3%)	⬆️
toxcore/TCP_server.c	78.5% <0%> (+2.5%)	⬆️
toxcore/LAN_discovery.c	85.8% <0%> (+2.8%)	⬆️
toxcore/TCP_client.c	67.5% <0%> (+2.8%)	⬆️

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