Support Go 1.14 WASM

[at-wat]

Nested t.Run on Go 1.14 WASM has runtime.goexit() routine at beginning.

Reference issue

pion/.goassets#15
pion/webrtc#1066

[Sean-Der]

nice find! you are killing it :)

[codecov]

Codecov Report

Merging #62 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
+ Coverage   82.81%   82.88%   +0.06%     
==========================================
  Files          17       19       +2     
  Lines        1554     1560       +6     
==========================================
+ Hits         1287     1293       +6     
  Misses        181      181              
  Partials       86       86              

Flag	Coverage Δ
#go	82.86% <100.00%> (+0.04%)	⬆️
#wasm	80.29% <100.00%> (+0.05%)	⬆️

Impacted Files	Coverage Δ
test/util.go	81.63% <100.00%> (+0.78%)	⬆️
test/util_nowasm.go	100.00% <100.00%> (ø)
test/util_wasm.go	100.00% <100.00%> (ø)

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