* Translation call text domain change from “wc-admin” to “woocommerce-admin”.
* Fix .pot file generation.
* Fix errantly closed array item in /revenue/stats controller.
* Rename plugin zip, main file, and repo name to "woocommerce-admin".
Composer can only run for PHP 7.1+, correct PHPUnit should already be specified in composer.json.
The PATH export in travis.yml ensures that PHPUnit v6 is used for PHP v7.2.