* Add CopyrightHeader support for sbt-boilerplate plugin.
* Add CopyrightHeader support for `*.proto` files.
* Add regex match for both `–` and `-` for CopyrightHeader.
* Add CopyrightHeader support for sbt build files.
* Update copyright from 2018 to 2019.
* Always add sender of GetContacts to client interactions
* Handover clients when receptionist leaves the cluster
* Revision based on code review
* Cluster receptionist only tracks connected clients