Update changelog

Update CHANGELOG in prep for v1.1.1 release

Release v1.1.0

Considered a minor version bump due to only features added and bugs fixed.

CTFE logging and path prefix. Mirroring. Utils and lib supports RPKI …

…extensions. Better non fatal x.509 error handling throughout utils and CTFE.

Minimal Gossip / Go 1.11 crypto fix / Utility umprovements

CTFE Quota and Enhancements

Adding Migration Tool / Client Additions / K8 Config

Merkle verification / Tracing / Demo script

Lifecycle test / Go 1.10.1

More control of verification, gRPClb, stackdriver metrics