Update travis ci badget to Github actions badge.

[drewwells]

Status badge can be created with the 3 dots button on actions page. The badge says no status, because github action is not configured to build the integration branch v2.

[codecov-io]

Codecov Report

Merging #384 (2777667) into v2 (a79558a) will decrease coverage by 7.68%.
The diff coverage is 89.18%.

@@            Coverage Diff             @@
##               v2     #384      +/-   ##
==========================================
- Coverage   83.58%   75.90%   -7.69%     
==========================================
  Files          30       31       +1     
  Lines         932      776     -156     
==========================================
- Hits          779      589     -190     
- Misses        114      139      +25     
- Partials       39       48       +9     

Impacted Files	Coverage Δ
chain.go	0.00% <ø> (-90.91%)	⬇️
interceptors/logging/payload.go	79.24% <50.00%> (-3.37%)	⬇️
interceptors/retry/retry.go	66.66% <70.00%> (-9.58%)	⬇️
interceptors/skip/interceptor.go	71.42% <71.42%> (ø)
interceptors/logging/interceptors.go	100.00% <100.00%> (ø)
interceptors/logging/logging.go	61.53% <100.00%> (-6.21%)	⬇️
interceptors/ratelimit/ratelimit.go	100.00% <100.00%> (ø)
interceptors/reporter.go	61.53% <100.00%> (-0.97%)	⬇️
interceptors/server.go	85.71% <100.00%> (+0.42%)	⬆️
interceptors/tags/fieldextractor.go	82.75% <100.00%> (-2.54%)	⬇️
... and 31 more

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[johanbrandhorst]

Thanks for your contribution!