Support sending transactional SMS messages

Adds support for sending transactional SMS messages

v4.1.1

Fixed

• Explicitly initialize a variable to avoid build errors (#143)

v4.1.0

Added

• Support for sending transactional push messages (#141)

v4.0.0

Changed

• Updated transactional email request parameter amp_body to body_amp for consistency across APIs (#137)

v3.5.1

Fixed

• Handle redirect responses from the track and app apis (#135)

v3.5.0

Added

• Added getAttributes method (#129)

Fixed

• Pass query parameters for getCustomersByEmail to prevent 400 responses from Customer.io (#132)

v3.4.1

Added

• Added disable_css_preprocessing and language optional fields (#127)

v3.4.0

Added

• Add export methods to the api class (#120)
• Add customer lookup by email method to the api class (#124)
• Add unsuppress method to the track class (#123)

Changed

• Update minimatch (dev only) (#121)

v3.3.6

Fixed

• Republish to npm since 3.3.5 didn't include the correct changes (Context)

v3.3.5

Fixed

• Add extra device attributes to attributes object in addDevice (#115)