Update README.md

README.md

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 ## About ##
 Scribd-dl helps downloading documents on [scribd.com](https://www.scribd.com/) without membership / sign-in.  
-2 modes are available:  
-- default:
-  - the .pdf file is generated by chromium's print function  
-- image-based:
-  - the .pdf file is generated by image snapshots taken for pages  
-
-It is prefer to use the `default` mode as it gives a better performance in generation time and file size.  
-`image-based` mode is a backup solution in case the `default` mode doesn't work as expected.
-
-Friendly reminder:  
-1. The .pdf files generated by `image-based` mode is formed by images, so it does **NOT** contain any text.  
 
 ## Development Plan ##
 Scribd obfuscates the .pdf files, the texts copied from the documents will become strange garbled message.