v3.15.0

Changelog

Features

• da8a8a9: feat: add Envelopes to v3 API (#873) (@morremeyer)

Others

• d7dcd75: test: add *testing.T as first argument for createTestTransactionV3 (#868) (@morremeyer)
• c168c47: chore: mark v2 as deprecated (#869) (@morremeyer)
• ce1d685: docs: remove redundant method comments (#870) (@morremeyer)