Update doid.md

updated home page to 
https://disease-ontology.org/
from 
http://disease-ontology.org/
    as this was not resolvable in the dashboard

Author: lschriml

ontology/doid.md

@@ -18,7 +18,7 @@ contact:
 depicted_by: http://www.disease-ontology.org/media/images/DO_logo.jpg
 description: An ontology for describing the classification of human diseases organized by etiology.
 domain: health
-homepage: http://www.disease-ontology.org
+homepage: https://www.disease-ontology.org
 in_foundry_order: 1
 license:
   label: CC0 1.0