Log Message:
Update to 0.15. From the changelog:

- Added the `canonical_engine` accessor, which returns the canonical
  engine name.
- Added `the canonical` method, which will replace the engine name with
  its canonical value if it's not already canonical.
- The `dbi_dsn` method of URI::vertica now returns an ODBC DSN instead
  of DBD::Pg, since the latter apparently does not work with Verica.
- Added a note to the `dbi_dsn` documentation that query params are
  included in the returned value.