fix lint errors

Author: dchukhin

pattern_library/templatetags/__init__.py

@@ -1 +1 @@
-# Template tags for django-pattern-library
+# Template tags for django-pattern-library

pattern_library/templatetags/pattern_library_tags.py

@@ -1,6 +1,7 @@
 from django import template
-from django.utils.safestring import mark_safe
 from django.templatetags.static import static
+from django.utils.safestring import mark_safe
+
 from pattern_library import get_setting
 
 register = template.Library()
@@ -25,15 +26,17 @@ def pattern_library_custom_css():
     css_content = []
 
     # Include external CSS file if specified
-    custom_css_path = get_setting('CUSTOM_CSS')
+    custom_css_path = get_setting("CUSTOM_CSS")
     if custom_css_path:
         try:
             css_url = static(custom_css_path)
-            css_content.append(f'<link rel="stylesheet" type="text/css" href="{css_url}">')
+            css_content.append(
+                f'<link rel="stylesheet" type="text/css" href="{css_url}">'
+            )
         except Exception:
             pass  # If static file handling fails, just skip the external file
 
-    return mark_safe('\n'.join(css_content))
+    return mark_safe("\n".join(css_content))
 
 
 @register.simple_tag
@@ -45,4 +48,4 @@ def pattern_library_site_title():
         {% load pattern_library_tags %}
         {% pattern_library_site_title %}
     """
-    return get_setting('SITE_TITLE')
+    return get_setting("SITE_TITLE")