Avoid blocking the event loop

[tyz]

time.sleep is a blocking call, use task.sleep instead (#172)

[thematrixdev]

Hello. Using the two updated files, there are these error messages.

[2914751896] name 'task' is not defined
09:26:12 – (ERROR) Home Assistant WebSocket API (custom integration)

The-Frame on: Error executing script. Unexpected error for call_service at pos 2: name 'task' is not defined
09:26:12 – (ERROR) Script (custom integration)

Have I missed anything? Thanks.

[jaruba]

@tyz task is indeed undefined in these files, if you fix the PR, I will merge it

[CashWilliams]

Attempted a fix in #192