changed BaseSchema.java and StringSchema.java

Author: sergeycherkasovv

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

@@ -26,8 +26,7 @@ public final boolean isValid(T value) {
                 .allMatch(t -> t.test(value));
     }
 
-
-    protected BaseSchema required() {
+    public BaseSchema required() {
         addValidation("required", Objects::nonNull);
         return this;
     }

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

@@ -3,7 +3,6 @@
 
 public final class StringSchema extends BaseSchema<String> {
 
-    @Override
     public StringSchema required() {
         addValidation("required", s -> s != null && !s.equals(""));
         return this;