language: go
go:
    - "1.11.x"
os:
    - linux
    - osx
    - windows
script:
    - env GO111MODULE=on make build
    - env GO111MODULE=on make test

language: go
go:
    - "1.12.x"
os:
    - linux
    - osx
    - windows
script:
    - make build
    - make test

Upgrade Travis Go to 1.12.x
Upgrade Travis Go to 1.12.x

Fixes Travis Windows build problem because go modules are enabled
by default in 1.12.x and don't need an environment variable to be
set.
