NLTK downloads added to dockerfile #10

Job	Run time
Test (3.12)	22s
deploy / Setup	4s
deploy / deploy-production	0s
deploy / deploy-staging / build-aws / Build (staging)	3m 14s
deploy / deploy-staging / build-gcp	-1s
deploy / deploy-staging / deploy-gcp-staging	-1s
deploy / deploy-staging / deploy-staging-aws / Deploy (staging)	8s
	3m 46s

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