Update vendor

Gopkg.lock

Gopkg.toml

vendor/github.com/Shopify/sarama/.gitignore

vendor/github.com/Shopify/sarama/.travis.yml

vendor/github.com/Shopify/sarama/CHANGELOG.md

vendor/github.com/Shopify/sarama/LICENSE

vendor/github.com/Shopify/sarama/Makefile

vendor/github.com/Shopify/sarama/README.md

vendor/github.com/Shopify/sarama/Vagrantfile

vendor/github.com/Shopify/sarama/acl_bindings.go

vendor/github.com/Shopify/sarama/acl_create_request.go

vendor/github.com/Shopify/sarama/acl_create_response.go

vendor/github.com/Shopify/sarama/acl_delete_request.go

vendor/github.com/Shopify/sarama/acl_delete_response.go

vendor/github.com/Shopify/sarama/acl_describe_request.go

vendor/github.com/Shopify/sarama/acl_describe_response.go

vendor/github.com/Shopify/sarama/acl_filter.go

vendor/github.com/Shopify/sarama/acl_types.go

...r/github.com/Shopify/sarama/add_offsets_to_txn_request.go

.../github.com/Shopify/sarama/add_offsets_to_txn_response.go