Python 3.10 compatibility

[hleskien]

Hi,

I get this in Python 3.8:

robotremoteserver.py:18: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.9 it will stop working
from collections import Mapping

Kind regards

Holger

[pekkaklarck]

Needs to update imports when working with this project the next time. Unfortunately I haven't had time for this project lately and with RF 3.2 still being under development won't have time in the near future either.

[hleskien]

Your ACK is enough for me at the moment. Thank you!

[tirkarthi]

I have created #59 to fix this. For Python 2 collections is used and for Python 3 collections.abc is used. The move was done in Python 3.4 to raise a deprecation so I assume Python 3.3 is not supported since it's EoL. Thanks.

[hleskien]

Thank you!

[pekkaklarck]

This fix is required with Python 3.10 where from collections import Mapping doesn't work anymore. Need to finally create a release with this fix.