[1.2.1] Pinned socketio/engineio dependency
This is a maintenance release to eliminate the error described in
https://plugins.jetbrains.com/plugin/13264-pycrunch--live-testing/reviews
and
#36
[207123] 2020-12-14 20:03:56,114 - engineio.server - ERROR - The client is using an unsupported version of the Socket.IO or Engine.IO protocols (further occurrences of this error will be logged with level INFO)