Append contents of old version to downgrade script
Append contents of old version to downgrade script

I just did this:

```
cat old_versions/cdb_dataservices_client--0.21.0.sql >> cdb_dataservices_client--0.22.0--0.21.0.sql
```

CartoDB/dataservices-api,CartoDB/dataservices-api,CartoDB/geocoder-api,CartoDB/geocoder-api,CartoDB/geocoder-api,CartoDB/geocoder-api,CartoDB/dataservices-api,CartoDB/dataservices-api