Remove slack

Author: cthoyt

ontology/uberon.md

@@ -102,7 +102,6 @@ publications:
 - id: https://www.ncbi.nlm.nih.gov/pubmed/25009735
   title: Unification of multi-species vertebrate anatomy ontologies for comparative biology in Uberon
 repository: https://github.com/obophenotype/uberon
-slack: https://obo-communitygroup.slack.com/archives/C01CR698CF2
 taxon:
   id: NCBITaxon:33208
   label: Metazoa

util/schema/registry_schema.json

@@ -378,9 +378,6 @@
       "type": "string",
       "format": "uri"
     },
-    "slack": {
-      "suggest": false
-    },
     "taxon": {
       "level": "info",
       "description": "'taxon' is an informative field. The value is the taxonomic identifier of the organism that is the subject of the ontology.",