Update dependencies

.travis.yml

vendor/cloud.google.com/go/internal/optional/optional.go

vendor/cloud.google.com/go/storage/acl.go

vendor/cloud.google.com/go/storage/bucket.go

vendor/cloud.google.com/go/storage/copy.go

vendor/cloud.google.com/go/storage/doc.go

vendor/cloud.google.com/go/storage/invoke.go

vendor/cloud.google.com/go/storage/storage.go

vendor/cloud.google.com/go/storage/writer.go

vendor/github.com/aws/aws-sdk-go/aws/config.go

...thub.com/aws/aws-sdk-go/aws/credentials/chain_provider.go

vendor/github.com/aws/aws-sdk-go/aws/session/doc.go

...or/github.com/aws/aws-sdk-go/aws/session/shared_config.go

vendor/github.com/aws/aws-sdk-go/aws/signer/v4/uri_path.go

...r/github.com/aws/aws-sdk-go/aws/signer/v4/uri_path_1_4.go

vendor/github.com/aws/aws-sdk-go/aws/signer/v4/v4.go

vendor/github.com/aws/aws-sdk-go/aws/version.go

.../github.com/aws/aws-sdk-go/private/endpoints/endpoints.go

...ithub.com/aws/aws-sdk-go/private/endpoints/endpoints.json

...hub.com/aws/aws-sdk-go/private/endpoints/endpoints_map.go