Remove GO15VENDOREXPERIMENT variable

[tnir]

Which problem is this PR solving?

• Removes GO15VENDOREXPERIMENT variable on development and CI.

Short description of the changes

• Even at the inception of the project, as this project supports only Go 1.6+ 321ba1b, we do not need to have GO15VENDOREXPERIMENT.

Signed-off-by: Takuya Noguchi takninnovationresearch@gmail.com

[tnir]

cf. jaegertracing/jaeger-client-go#396

[codecov]

Codecov Report

Merging #71 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #71   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          26     26           
  Lines         890    890           
=====================================
  Hits          890    890

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[yurishkuro]

Thanks