snappi 0.12.1 HttpApi object has no attribute 'transmit_state'

[plaviz]

[snappi version]
pip3 list | grep snappi
snappi 0.12.1
snappi-convergence 0.2.3
snappi-ixnetwork 0.9.1

Create a script hello.py from https://otg.dev/clients/snappi/

~/scripts$ python3 hello.py
/usr/lib/python3/dist-packages/urllib3/connectionpool.py:1015: InsecureRequestWarning: Unverified HTTPS request is being made to host 'localhost'. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
warnings.warn(
Traceback (most recent call last):
File "/home/phille/scripts/hello.py", line 26, in
ts = api.transmit_state()
AttributeError: 'HttpApi' object has no attribute 'transmit_state'

Workaround:
The above script works when downgrading snappi to version 0.11.17

Is there any document that trace the changes in the library?