1.6.0

Some Intent operations now cache requests that would otherwise fall through
to the homeserver which can be expensive. This is configurable for Intents
via the opts.caching.ttl and size options.

AgeCounters now allow you to set your own time period buckets.

Added a new function Intent.getEvent which will fetch events
from the homeserver without any context information, which should
be quick.

MembershipCache is now exposed to let folks read and write to the cache
while also letting the bridge access it.