update: README.md: linking to archive.org

[PtrMan]

#614

[codecov]

Codecov Report

Merging #615 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #615   +/-   ##
=========================================
  Coverage     71.45%   71.45%           
  Complexity     2615     2615           
=========================================
  Files           107      107           
  Lines          8666     8666           
  Branches       1874     1874           
=========================================
  Hits           6192     6192           
  Misses         1852     1852           
  Partials        622      622           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a16e563...50a6415. Read the comment docs.

[patham9]

the right link now is https://cis.temple.edu/~pwang/GTI-book/

[PtrMan]

but the content is different, the old page has/has more information