old_contents: """
  Database mutex app.
  
  This reusable Django application provide low-level API for locking multiple parallel processes
   using mutex stored in the database.
  """
  
  default_app_config = 'apps.dbmutex.apps.DatabaseMutexConfig'
  
  # Friendly import
  from .engine import MutexLock
  
new_contents: """
  Database mutex app.
  
  This reusable Django application provide low-level API for locking multiple parallel processes
   using mutex stored in the database.
  """
  
  # Friendly import
  from .engine import MutexLock
  from .exceptions import Error, LockError, UnlockError, AlreadyLockedError, NoLockError, LockTimeoutError
  
  default_app_config = 'apps.dbmutex.apps.DatabaseMutexConfig'
  
subject: Update friendly imports