Added release column to session table.
Added release column to session table.

thomasmaurel/ensj-healthcheck,thomasmaurel/ensj-healthcheck,Ensembl/ensj-healthcheck,Ensembl/ensj-healthcheck,Ensembl/ensj-healthcheck,Ensembl/ensj-healthcheck,thomasmaurel/ensj-healthcheck,thomasmaurel/ensj-healthcheck