As we're moving toward Synapse v1.0, things are beginning to stabilize.
Upgrading from v0.99.0 to v0.99.1 should be painless.
If you've been overriding the default configuration so that you can terminate TLS at the Synapse side (`matrix_synapse_no_tls: false`), you'll now have to replace this custom configuration with `matrix_synapse_tls_federation_listener_enabled: true`. The `matrix_synapse_no_tls` variable is no more.
# 2019-02-06
## Synapse v0.99 support and preparation for Synapse v1.0