Release with String support in the API

Besides the already supported const char*, now it's possible to use String arguments in the API.

Support String in API

This release adds support for String to the API.

Some formatting and cleanup

No functional changes, just some formatting and cleanup has been applied to the library.

Add startRequest() to API

This new method, the startRequest() will reset the request settings on the http client. It's useful when you intend to submit multiple request in a row with a different set of settings.

Improve README

• Examples section updated

Add example and improve README

• AioFeedNameId.ino added (Get AIO Feeds using the REST API, parse the JSON and list name/Ids)
• Improve the README

Fix AioFeeds example

Fix JSON parsing example in AioFeeds.ino

Add AIO feed parsing with ArduinoJson example

examples/AioFeeds/AioFeeds.ino has been updated to demonstrate how to parse the JSON response body using the ArduinoJson library

Reworked API, improved examples

• Added an Adafruit IO REST API example
• Added an async POST example
• Added new method finished()
• Template class dropped, instead, a fixed number of request headers added (up to 16)
• Description in README updated and improved

New API, new doc and updated examples

• For maximum flexibility and efficiency the number of request headers is now configurable by the user at compile time by using non-type parameter template class.
• The README contains now a better description.
• The examples have been update to match the API change.