Mention Go v1.8+ is required
Remove Travis test with Go 1.7.
language: go
go:
- "1.8"
- "1.9"
- "1.10"
- master
matrix:
allow_failures:
- go: master
fast_finish: true
branches:
only:
- master
install:
- go get github.com/spf13/pflag
- go get github.com/pkg/errors
- go get github.com/jung-kurt/gofpdf