* Upgrade dependencies (Miroslav Bajtoš)
 * Upgrade codebase to ES6 (Miroslav Bajtoš)
 * Drop support for Node.js 4.x (Miroslav Bajtoš)
 * add delete method (Matteo Padovano)
 * Update LICENSE (Diana Lau)
 * Add stalebot configuration (Kevin Delisle)
 * Update Issue and PR Templates (#36) (Sakib Hasan)
 * Update translated strings Q3 2017 (Allen Boone)
 * update messages.json (Diana Lau)
 * Add CODEOWNER file (Diana Lau)