1.67.2

Chore

• deps: bump requests from 2.30.0 to 2.31.0 in /tests (#380) (cdf91df6)

Features

• switch to latest release a2 library (#362) (728fe169)
• add broadcast (megaphone) support (#381) (97d3a3ae)
• complete (mostly) the WebPushClient (#379) (f7110214)
• move tests to python3 (08bd46b8)