docs: make the first letter uppercase

kenjis · kenjis · commit f21b3b8bfebe · 2023-03-20T10:55:18.000+09:00
diff --git a/README.md b/README.md
@@ -82,7 +82,7 @@ $twig = $this->twig->getTwig();
 
 Some helpers are added the functionality of auto-escaping for security.
 
-### Adding Your Functions & filters
+### Adding Your Functions & Filters
 
 You can add your functions and filters with configuration:
 
