Features from optional dependencies

chrono implicit feature

Enables chrono

chrono:

Date and time library for Rust

hmac implicit feature

Enables hmac

hmac:

Generic implementation of Hash-based Message Authentication Code (HMAC)

lettre implicit feature

Enables lettre

lettre:

Email client

reqwest implicit feature

Enables reqwest

reqwest:

higher level HTTP client library

serde-xml-rs implicit feature

Enables serde-xml-rs

serde-xml-rs:

xml-rs based deserializer for Serde (compatible with 0.9+)