Edit regex for schemas filenames

[alekseyld]

Hello!
The documentation says use "drift_schema_vX.json" file template for schema dump, but cli tools works only with "moor_schema_vX.json" and not generate schema files for tests.

I propose to add an additional group to the regular expression in this line 225

static final _filenames = RegExp(r'moor_schema_v(\d+)\.json');
change to
static final _filenames = RegExp(r'(moor|drift)_schema_v(\d+)\.json');

And also change line 128 where regex is used.

final version = int.parse(match.group(1));
change to
final version = int.parse(match.group(2));

[simolus3]

Good catch, thank you! I've fixed this on develop in 849b0de.