Add convenient get_typename method to DesignVariable (SMTorg#452)

Prepare release 2.0b3 (SMTorg#432)

* Enforce black format

* Bump 2.0b3

* Format with black 23.3.0

* Update doc

Prepare 2.0b2 (SMTorg#427)

* Bump version 2.0b2

* Use black 23.3.0 to reformat

Prepare pre-release 2.0b1 (SMTorg#413)

* Require Python 3.7+

* Bump version 2.0b1

Bump 1.3.0

Bump 1.2.0

Bump 1.1.0

Prepare SMT 1.0 (SMTorg#305)

* Remove 2.7 classifier

* Bump 1.0

Update doc for 0.9.0

bump 0.8.0