Added TLS backend selection features & `Default`, removed `get_`/`Get…

…` prefixes (#25)

* Added `Default` to `model::sms::Message`, adjusted docs & README accordingly, fixed line breaks (proper markdown) and headline capitalization in README.

* Fixed broken user agent string builder.

* Bumped dependencies, docs.

* Fixed docs, added feature flags for selecting TLS implementation, masked out code not used for some features.

* rustfmt and spelling in docs.

* Fixed failing doctests.

* * Added `Default` trait everywhere.
* Simplified `new()` where possible.
* Renamed `enum` variants to `PascalCase` (Rust naming guidelines).
* Removed `get_` prefix from all getters/everywhere (Rust naming guidelines).
* Simplified some places.

* rustfmt.

* Made clippy happy.

* Renamed `WhatsappClient` to `WhatsAppClient`.

* Bumped deps.

* Removed `Get` prefix from struct names as it was related to `get_` prefixed methods which have since been renamed."

* Added 'rustls' to and sorted .cspell.json.

---------

Co-authored-by: Mike Elsmore <[email protected]>

Fix/publish to crate (#28)

* Revamp the file, see if this works

* Add the no verify flag

Merge pull request #11 from strosek/fix/update-wa-category

Fix/update wa category

Merge pull request #10 from strosek/feat/add-tfa

Add 2FA endpoints

Merge pull request #8 from ukmadlz/feat/extra-github-checks

Feat: Add code quality checks to repo

Merge pull request #7 from infobip-community/add-email

Add email channel, get SMS logs issue fix

Merge pull request #6 from infobip-community/add-whatsapp

Add Whatsapp support

Merge pull request #5 from infobip-community/add-whatsapp-essentials

Add whatsapp essentials, fix Readme