Results 2 issues of Rogier

# Fixes # Adds the "validations" method to the http client. So it aligns with the [SendGrid Api Reference](https://docs.sendgrid.com/api-reference/e-mail-address-validation/validate-an-email). ### Checklist - [x] I acknowledge that all my contributions will...

I tried compiling from source for the new version of Teller and wanted to let you know I needed to upgrade a dependency to match the Hashicorp Vault dependency of...