[ENSCORESW-3077] Travis: Unify configuration of Slack notifications
[ENSCORESW-3077] Travis: Unify configuration of Slack notifications

muffato/ensembl,muffato/ensembl,james-monkeyshines/ensembl,muffato/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,Ensembl/ensembl,muffato/ensembl,james-monkeyshines/ensembl