Update module oschwald/maxminddb-golang to v0.2.0

go.mod

go.sum

vendor/github.com/oschwald/maxminddb-golang/.gitignore

vendor/github.com/oschwald/maxminddb-golang/.gitmodules

vendor/github.com/oschwald/maxminddb-golang/.travis.yml

vendor/github.com/oschwald/maxminddb-golang/LICENSE

vendor/github.com/oschwald/maxminddb-golang/README.md

vendor/github.com/oschwald/maxminddb-golang/appveyor.yml

vendor/github.com/oschwald/maxminddb-golang/build.cmd

vendor/github.com/oschwald/maxminddb-golang/decoder.go

vendor/github.com/oschwald/maxminddb-golang/errors.go

vendor/github.com/oschwald/maxminddb-golang/reader.go

.../github.com/oschwald/maxminddb-golang/reader_appengine.go

vendor/github.com/oschwald/maxminddb-golang/reader_other.go

vendor/github.com/oschwald/maxminddb-golang/reader_unix.go

...or/github.com/oschwald/maxminddb-golang/reader_windows.go

vendor/github.com/oschwald/maxminddb-golang/traverse.go

vendor/github.com/oschwald/maxminddb-golang/verifier.go

vendor/modules.txt