started to update README for schema 20 eg new sql for getting toplevel seq names
started to update README for schema 20 eg new sql for getting toplevel seq names

ckongEbi/ensembl-compara,ckongEbi/ensembl-compara,dbolser-ebi/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,danstaines/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,kumarsaurabh20/ensembl-compara,Ensembl/ensembl-compara,dbolser-ebi/ensembl-compara,Ensembl/ensembl-compara,etapanari/ensembl-compara,etapanari/ensembl-compara,kumarsaurabh20/ensembl-compara,etapanari/ensembl-compara,Ensembl/ensembl-compara,danstaines/ensembl-compara,ckongEbi/ensembl-compara,danstaines/ensembl-compara,danstaines/ensembl-compara,kumarsaurabh20/ensembl-compara,Ensembl/ensembl-compara,dbolser-ebi/ensembl-compara,kumarsaurabh20/ensembl-compara,etapanari/ensembl-compara,danstaines/ensembl-compara