text: Title: Fix style issue `Doc line too long FLK-W505`
  Body: Fix `Doc line too long  FLK-W505`: https://deepsource.io/gh/scanapi/scanapi/issue/FLK-W505/occurrences
  
  ![image](https://user-images.githubusercontent.com/2728804/127705974-4b874dee-1d9d-41f9-b3ee-891a21c021f8.png)
  
  > Docstring line lengths are recommended to be no greater than 79 characters.
  
  Child of https://github.com/scanapi/scanapi/issues/405