x: supported go version

[mmcloughlin]

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[codecov-commenter]

Codecov Report

Merging #294 (15a3312) into master (5106a44) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #294   +/-   ##
=======================================
  Coverage   76.01%   76.01%           
=======================================
  Files          65       65           
  Lines       20604    20604           
=======================================
  Hits        15663    15663           
  Misses       4860     4860           
  Partials       81       81           

Flag	Coverage Δ
integration	11.84% <100.00%> (ø)
stress	?
unittests	73.13% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
build/context.go	58.40% <100.00%> (ø)

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