Bug Fixes code: fix for CVE-2020-7743 (#4833) (543d830) docs: remove warning about Custom Modules (#4882) (c4445c3) Features channel-vonage: add channel-vonage (#4789) (f17695f) core: conversation attributes (#4815) (256fcf4) core: remove redundant read/writes to flow files (#4715) (36468bc) studio: add support for audio and video content-types (#4816) (95ba80d), closes #4820