docType must be also required

[alfredomp]

SPINE-json-schema/schemas/cohort.schema.json

Line 141 in a3b289c

"required": ["name","privacy","uuid","pi"]

@katiamar63 could you add the docType to the required properties?

[katiamar63]

OK, so far it was not required by convention but it is a good idea

[katiamar63]

Change applied in commit above