improve: support js,wasm

[shynome]

those code copy from /go/src/net/http/transport_default_other.go

closes #610

[jeevatkm]

@shynome Can you please add test case?

[shynome]

I'm sorry, I don't have time to add test case because I don't use resty anymore.
now I just use http client with some function wrap

as you can see, those code is copy from golang std library net/http/transport_default_other.go

[jeevatkm]

@shynome Thanks for getting back. I see; I will take it up later on.

[jeevatkm]

Ref: https://github.com/golang/go/blob/master/src/net/http/transport_default_wasm.go

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.11% ⚠️

Comparison is base (15cedd4) 95.73% compared to head (6da8494) 95.63%.
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #683      +/-   ##
==========================================
- Coverage   95.73%   95.63%   -0.11%     
==========================================
  Files          11       12       +1     
  Lines        1571     1603      +32     
==========================================
+ Hits         1504     1533      +29     
- Misses         41       42       +1     
- Partials       26       28       +2     

Files Changed	Coverage Δ
transport.go	100.00% <100.00%> (ø)
transport_other.go	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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