Bad URL "A Design Methodology for Reliable Software Systems"

[buhtz]

Dear @shubheksha ,

that URL points to a "bad" side. The PDF is gone.

System-Design-Papers/README.md

Line 11 in 824ad37

- A Design Methodology for Reliable Software Systems [[paper](https://valbonne-consulting.com/papers/classic/Liskov_72-Design_Methodology_for_Reliable_Software_Systems.pdf)]

I wasn't able to reconstruct the original via the Wayback Machine. But G-o-o-g-l-e gave something.
Is that the correct paper?
https://doi.org/10.1145/1479992.1480018

I would suggest to always use DOI links if you have one. They are persistent by definition.

I haven't checked the other URLs in your README.md.