Commits
Antoine Pitrou authored fc7977a670f
ARROW-4363: [CI] [C++] Add CMake format checks - Add a top-level script that reformats all known CMake files in the source tree - Add a lint step in Travis that checks CMake files are properly formatted Requires [cmake_format](https://github.com/cheshirekow/cmake_format) and Python 3. Author: Antoine Pitrou <antoine@python.org> Closes #3606 from pitrou/ARROW-4363-cmake-format and squashes the following commits: 762df291 <Antoine Pitrou> Add mention in cpp/README.md 9073af98 <Antoine Pitrou> ARROW-4363: Add CMake format checks