Use dbName for field when mapToDbSchema option is true

In line 91 of table.ts, replace : 
```typescript
      return `  ${field.name} ${fieldType}${generateColumnDefinition(field)}`;
``` 
by

```typescript
      return `  ${mapToDbSchema && field.dbName ? field.dbName : field.name} ${fieldType}${generateColumnDefinition(field)}`;
```