Apply php-cs-fixer fixers

- braces
- function_declaration
- lowercase_keywords
- method_argument_space
- no_spaces_inside_parenthesis
- no_trailing_whitespace
- no_trailing_whitespace_in_comment
- single_blank_line_at_eof

tests/MinifyCommentPreserverTest.php

@@ -31,4 +31,4 @@ class MinifyCommentPreserverTest extends TestCase
         ++$callCount;
         return $callCount . strtoupper($content);
     }
-}
+}