Update SingleSpaceAfterStatementFixer sample (#536)

Author: kubawerlos

README.md

@@ -455,9 +455,9 @@ Configuration options:
 ```diff
  <?php
 -$foo = new Foo();
--echo$foo->__toString();
+-echo$foo->bar();
 +$foo = new Foo();
-+echo $foo->__toString();
++echo $foo->bar();
 ```
 
 #### SingleSpaceBeforeStatementFixer

src/Fixer/SingleSpaceAfterStatementFixer.php

@@ -88,7 +88,7 @@ public function getDefinition(): FixerDefinitionInterface
  {
  return new FixerDefinition(
  'Single space must follow - not followed by semicolon - statement.',
- [new CodeSample("<?php\n\$foo = new Foo();\necho\$foo->__toString();\n")]
+ [new CodeSample("<?php\n\$foo = new Foo();\necho\$foo->bar();\n")]
  );
  }