old_contents: from django.core.exceptions import ImproperlyConfigured
  
  class BrushfireExcpetion(Exception):
      pass
  
  class BrushfireConfigException(ImproperlyConfigured):
      pass
  
new_contents: from django.core.exceptions import ImproperlyConfigured
  
  class BrushfireException(Exception):
      pass
  
  class BrushfireConfigException(ImproperlyConfigured):
      pass
  
subject: fix spelling error