Migrate Schema.js to adaptive mongo collection.

src/Adapters/Storage/Mongo/MongoCollection.js

@@ -54,7 +54,7 @@ export default class MongoCollection {
     return this._mongoCollection.findAndModify(query, [], update, { new: true }).then(document => {
       // Value is the object where mongo returns multiple fields.
       return document.value;
-    })
+    });
   }
 
   insertOne(object) {
@@ -68,6 +68,10 @@ export default class MongoCollection {
     return this._mongoCollection.update(query, update, { upsert: true });
   }
 
+  updateOne(query, update) {
+    return this._mongoCollection.updateOne(query, update);
+  }
+
   updateMany(query, update) {
     return this._mongoCollection.updateMany(query, update);
   }