map race in GS transport

[dirkmc]

Fixes #206

[codecov-commenter]

Codecov Report

Merging #208 (c17b47b) into master (e69af10) will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #208      +/-   ##
==========================================
+ Coverage   65.05%   65.12%   +0.07%     
==========================================
  Files          24       24              
  Lines        2624     2624              
==========================================
+ Hits         1707     1709       +2     
+ Misses        575      574       -1     
+ Partials      342      341       -1     

Impacted Files	Coverage Δ
transport/graphsync/graphsync.go	77.77% <ø> (ø)
channelmonitor/channelmonitor.go	73.27% <0.00%> (-0.93%)	⬇️
network/libp2p_impl.go	72.26% <0.00%> (+3.36%)	⬆️

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