add a call to weaken to work around the circular reference between variation features and transcript variations, this fixes a memory leak in the SNP effect predictor
add a call to weaken to work around the circular reference between variation features and transcript variations, this fixes a memory leak in the SNP effect predictor

Ensembl/ensembl-variation,dbolser/ensembl-variation,dbolser-ebi/ensembl-variation,dbolser/ensembl-variation,Ensembl/ensembl-variation,willmclaren/ensembl-variation,Ensembl/ensembl-variation,willmclaren/ensembl-variation,dbolser-ebi/ensembl-variation,dbolser/ensembl-variation,Ensembl/ensembl-variation,dbolser-ebi/ensembl-variation,Ensembl/ensembl-variation,willmclaren/ensembl-variation,dbolser/ensembl-variation,willmclaren/ensembl-variation,willmclaren/ensembl-variation