* Disable package-lock feature of npm (Miroslav Bajtoš)
 * Upgrade dependencies to latest versions (Miroslav Bajtoš)
 * Upgrade chai & dirty-chai to latest (Miroslav Bajtoš)
 * Upgrade js2xmlparser to latest (Miroslav Bajtoš)
 * Upgrade mocha to latest (Miroslav Bajtoš)
 * Travis: add Node.js 10.x to the build matrix (Miroslav Bajtoš)
 * Drop support for Node 4.x (Miroslav Bajtoš)