Fails with latest Version of MySQL (8.0.12)

When run under the latest version of MySQL (8.0.12) (and perhaps others) `import-dumps` fails.

However, adding the following to the top of `geonames_import_data.sql` seems to fix it,
though I do not think this solution is good practice (with respect to security).

```bash
SET GLOBAL local_infile = 1;

...
```