fix: code style issue

Author: shyim

tests/OptionsTest.php

@@ -25,7 +25,7 @@ public function testShouldWrite()
         (new Process(['git', 'config', 'user.name', 'Unit test'], FLEX_TEST_DIR))->mustRun();
         (new Process(['git', 'config', 'user.email', ''], FLEX_TEST_DIR))->mustRun();
 
-        $filePath = FLEX_TEST_DIR . '/a.txt';
+        $filePath = FLEX_TEST_DIR.'/a.txt';
         file_put_contents($filePath, 'a');
         (new Process(['git', 'add', '-A'], FLEX_TEST_DIR))->mustRun();
         (new Process(['git', 'commit', '-m', 'setup of original files'], FLEX_TEST_DIR))->mustRun();