* Untyped to classic naming convention #24717
* Added entry of naming convention change to migration docs.
* Rename `toUntyped` to `toClassic` in adapters
* 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.