add

Author: Bascy6

app/src/main/java/hexlet/code/schemas/BaseSchema.java

@@ -3,6 +3,7 @@
 public abstract class BaseSchema<T extends BaseSchema<T>> {
     protected boolean isRequired = false;
 
+    @SuppressWarnings("unchecked")
     public T required() {
         this.isRequired = true;
         return (T) this;