Fix move quoting

rpi/api-resources/board-mate.yaml

@@ -6,7 +6,6 @@ info:
 servers:
   - url: "https://boardmate_api"
 paths:
-
   /games/{id}:
     get:
       summary: "GET games/{id}"
@@ -55,7 +54,7 @@ paths:
         content:
           application/json:
             schema:
-              type: "string"
+              $ref: "#/components/schemas/MoveDto"
         required: true
       responses:
         "200":
@@ -109,4 +108,11 @@ components:
         increment:
           type: "integer"
           format: "int32"
-          nullable: true
+          nullable: true
+
+    MoveDto:
+      type: "object"
+      properties:
+        notation:
+          type: "string"
+          nullable: false