v0.1.35

- Fixes for the service directory: discard invalid records instead of aborting the start of the directory.
- Key pinning for service directory admins: Certificates with the 'sd-admin' role can only push entries to the service directory if either no key is pinned for the name given in the certificate or if the pinned key for the name matches the fingerprint of the certificate.
- gRPC connection improvements and bugfixes.
- Small improvements in the documenation.
- Added more unit and integration tests for the gRPC client and server.