Authorize colon (":') in dataset codes
IMF provides WEO (World Economic Outlook) releases twice a year (April and October). Until now, DBnomics only provides last release of WEO and WEOAGG datasets. From now (see dbnomics-fetchers/management#718 (closed)), each releases will be provided as a new dataset.
These new datasets will be named as WEO:{year}-{month}
and WEOAGG:{year}-{month}, e.g
WEO:2020-04`.
At this time, colon character (":") is not allowed for dataset codes. Validation errors are emitted for these new datasets.
This merge-request add the ability to use colon characters within dataset codes.