Added support for API v2.4
Added support for new completion callback options
Added support for specifying a custom wait time while submitting and retrieving email verification jobs
Added support for exporting completed email verification jobs in different output formats (CSV, Excel, Excel 97-2003)
Breaking change: the default job submission and retrieval behavior is now to wait for the completion of jobs (but it is possible to change that through the new WaitOptions class)
Bumped dependencies
Improved documentation