v1.9.0 Major release with grammar change

The main change in v1.9.0 is the soft deprecation of add_* in favour of annotation_*.

Other minor improvements are listed below.

What's Changed

• update tests and add padding by @stemangiola in #102
• update framework by @stemangiola in #99
• Dev by @stemangiola in #103

Full Changelog: v1.8.1...v1.9.0