Update README.md

Author: gammasoft71

README.md

@@ -272,15 +272,14 @@ namespace unit_tests {
   class test_class_(hello_world_test) {
     auto test_method_(create_string_from_literal) {
       auto s = string {"Hello, World!"};
-      valid::are_equal(13_z, s.length());
-      assert::are_equal("Hello, World!", s);
+      valid_that(s.length()).is().equal_to(13_z);
+      assert_that(s).is().equal_to("Hello, World!");
     }
 
     auto test_method_(create_string_from_chars) {
       auto s = string {'H', 'e', 'l', 'l', 'o', ',', ' ', 'W', 'o', 'r', 'l', 'd', '!'};
-      valid::are_equal(13_z, s.length());
-      string_assert::starts_with("Hello,", s);
-      string_assert::does_not_end_with(" le monde!", s);
+      valid_that(s.length()).is().equal_to(13_z);
+      assert_that(s).does().start_with("Hello,").and_().does().end_with(" World!");
     }
   };
 }
@@ -290,29 +289,24 @@ auto main() -> int {
 }
 ```
 
-**or without helpers**
+**or without constraints**
 
 ```cpp
 #include <xtd/xtd>
 
 namespace unit_tests {
-  class hello_world_test;
-  
-  auto hello_world_test_class_attr = test_class_attribute<hello_world_test> {"unit_tests::hello_world_test"};
-  class hello_world_test : public test_class {
-    test_method_attribute create_string_from_literal_attr {"create_string_from_literal", *this, &hello_world_test::create_string_from_literal};
-    auto create_string_from_literal() -> void {
+  class test_class_(hello_world_test) {
+    auto test_method_(create_string_from_literal) {
       auto s = string {"Hello, World!"};
       valid::are_equal(13_z, s.length());
       assert::are_equal("Hello, World!", s);
     }
     
-    test_method_attribute create_string_from_chars_attr {"create_string_from_chars", *this, &hello_world_test::create_string_from_chars};
-    auto create_string_from_chars() -> void {
+    auto test_method_(create_string_from_chars) {
       auto s = string {'H', 'e', 'l', 'l', 'o', ',', ' ', 'W', 'o', 'r', 'l', 'd', '!'};
       valid::are_equal(13_z, s.length());
       string_assert::starts_with("Hello,", s);
-      string_assert::does_not_end_with(" le monde!", s);
+      string_assert::does_end_with(" World!", s);
     }
   };
 }