docs: update links in README.md (#10)

README.md

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 # Pepto Symbol
 
-Pepto Symbol lets you use [S3](http://aws.amazon.com/s3/) as a [Windows symbol server](http://msdn.microsoft.com/en-us/library/windows/desktop/ms680693%28v=vs.85%29.aspx) for debugging Windows-based applications.
+Pepto Symbol lets you use [S3](http://aws.amazon.com/s3/) as a [Windows symbol server](https://learn.microsoft.com/en-us/windows/win32/debug/symbol-servers-and-symbol-stores) for debugging Windows-based applications.
 
 ### Wait, what's a symbol server?
 
 "Symbol files" (aka PDB files) contain information about your software that a debugger can use to show you backtraces, local variables, etc. They are generated by the compiler when you build your software. Debugging is a nightmare without symbols. Really.
 
-A "symbol server" hosts symbol files for Windows-based software. Debuggers use symbol servers to obtain symbol files for the software you're debugging automatically. John Robbins has written [a great article explaining all of this](http://www.wintellect.com/CS/blogs/jrobbins/archive/2009/05/11/pdb-files-what-every-developer-must-know.aspx) and more on his blog. Symbol servers can serve symbol files over HTTP or a Windows file share.
+A "symbol server" hosts symbol files for Windows-based software. Debuggers use symbol servers to obtain symbol files for the software you're debugging automatically. John Robbins has written [a great article explaining all of this](https://www.atmosera.com/blog/pdb-files-what-every-developer-must-know/) and more on his blog. Symbol servers can serve symbol files over HTTP or a Windows file share.
 
 ### That doesn't sound so hard. Why do I need this?