Request: Add small delay before restart to allow sending response

[d42ohpaz]

I noticed when using the / POST endpoint for setting the ssid and password that the device will restart before the browser gets a response back from the server. By adding a small delay before restarting, there is enough time for the web server to finish processing the request.

[d42ohpaz]

This addresses #103

[d42ohpaz]

Re: failed build, it looks like a problem on the CI server:

$ platformio update
Error: Python 3.6 or later is required for this operation.
Please check a migration guide:
https://docs.platformio.org/en/latest/core/migration.html#drop-support-for-python-2-and-3-5
The command "platformio update" failed and exited with 1 during .

Or is there something I need to do on my end?

[nrwiersma]

Can you please rebase onto master, this will fix the CI issue.

[nrwiersma]

Thanks for the contribution.