Raise exception when watch returns an error

[JacobHenner]

In kubernetes_asyncio/watch/watch.py, there is a comment about raising an exception when a watch returns an error. Specifically:

kubernetes_asyncio/kubernetes_asyncio/watch/watch.py

Lines 91 to 96 in b33cde2

	# Something went wrong. A typical example would be that the user
	# supplied a resource version that was too old. In that case K8s would
	# not send a conventional ADDED/DELETED/... event but an error. Turn
	# this error into a Python exception to save the user the hassle.
	if js['type'].lower() == 'error':
	return js

However, this doesn't seem to have been implemented.