Update API version to 60.
Update API version to 60.

mjg17/ensembl,james-monkeyshines/ensembl,muffato/ensembl,danstaines/ensembl,james-monkeyshines/ensembl,willmclaren/ensembl,willmclaren/ensembl,mjg17/ensembl,at7/ensembl,james-monkeyshines/ensembl,at7/ensembl,muffato/ensembl,at7/ensembl,Ensembl/ensembl,muffato/ensembl,james-monkeyshines/ensembl,mjg17/ensembl,Ensembl/ensembl,danstaines/ensembl,Ensembl/ensembl,danstaines/ensembl,Ensembl/ensembl,muffato/ensembl,at7/ensembl,mjg17/ensembl