NEW version (December 2021)
- more available variant features present, check [here](https://github.com/KalinNonchev/gnomAD_DB/blob/master/gnomad_db/pkgdata/gnomad_columns.yaml)
- `get_maf_from_df` renamed to `get_info_from_df`
- `get_maf_from_str` renamed to `get_info_from_str`
- `genome`=["Grch37"|"Grch38"] argument have to be specified, when initializing the database