Update db schema to correspond with migrations

db/schema.rb

@@ -1700,7 +1700,7 @@ ActiveRecord::Schema.define(version: 20170905112933) do
   add_foreign_key "issue_assignees", "users", name: "fk_5e0c8d9154", on_delete: :cascade
   add_foreign_key "issue_metrics", "issues", on_delete: :cascade
   add_foreign_key "issues", "projects", name: "fk_899c8f3231", on_delete: :cascade
-  add_foreign_key "issues", "users", column: "author_id", name: "fk_05f1e72feb", on_delete: :cascade
+  add_foreign_key "issues", "users", column: "author_id", name: "fk_05f1e72feb", on_delete: :nullify
   add_foreign_key "label_priorities", "labels", on_delete: :cascade
   add_foreign_key "label_priorities", "projects", on_delete: :cascade
   add_foreign_key "labels", "namespaces", column: "group_id", on_delete: :cascade