development of more use cases

[andrewsu]

While the technical infrastructure for data aggregation and integration are sound, we continue to explore use cases that will test whether our knowledge ecosystem is complete enough to answer realistic biomedical questions.

Related issues:

• medical genetics: build: ⬆️ upgrade query_graph_handler dependency biothings_explorer#134
• target ID from phenotypic screens: Fix multihop not working issue biothings_explorer#135

[andrewsu]

per meeting 2021-01-19, tagging @AlexanderPico and @khanspers

[andrewsu]

Note to self: see also potential partnership with RCHSD on rare disease therapeutics