Add EU url

[jamrbranco89]

Hi,

According to the documentation the request should be parametrized according to the data residency policies: for US-based Workspaces, use api.segmentapis.com. For EU-based Workspaces, eu1.api.segmentapis.com.

Could you introduce that parameter to redirect to the correct place?

https://docs.segmentapis.com/tag/Getting-Started

Thanks. Great work :)