3.18.0

 * fix: preserve datasource name (Kevin Scroggins)
 * Update Copyright Years (Justin Ross)
 * Support options.filter in createChangeStream (Edward Choh)
 * fixup! add top-level dep on eslint-plugin-mocha (Miroslav Bajtoš)
 * Update eslint and eslint-config to latest (Miroslav Bajtoš)
