[TASK] Always use a backslash when calling global functions

Using a leading backslash when calling a function in the global namespace provides a (small) performance benefit. Adjust the PHP CS Fixer configuration to add any missing backslashes.
MyIntervals · Jun 19, 2020 · 0d8753e · 0d8753e
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -10,6 +10,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
   ([#894](https://github.com/MyIntervals/emogrifier/pull/894))
 
 ### Changed
+- Upgrade to PHPUnit 7.5
+  ([#908](https://github.com/MyIntervals/emogrifier/pull/908))
 - Update the development tools
   ([#898](https://github.com/MyIntervals/emogrifier/pull/898),
   [#895](https://github.com/MyIntervals/emogrifier/pull/895))

diff --git a/config/php-cs-fixer.php b/config/php-cs-fixer.php
@@ -43,8 +43,7 @@
             'method_separation' => true,
             'modernize_types_casting' => true,
             'native_function_casing' => true,
-            // not yet, but maybe later to improve performance
-            // 'native_function_invocation' => true,
+            'native_function_invocation' => true,
             'new_with_braces' => true,
             'no_alias_functions' => true,
             'no_blank_lines_after_class_opening' => true,