Update gotak import path to fix Travis build
Update import path in the gotak subdir so that Travis tests can be played
against the Github repository.
Also, add missing dependencies to the Travis YAML file.
language: go
go:
- "1.7"
- "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