tezt: update the README file

Julien Sagotrequested to merge
sagotch@tezt-readme-update into master
  • lib subdirectory is gone since f2cc78e2272b69f1263c8147b5cca511129db1f0 Tezt: use external library.
  • For what I understood _regressions does not exists anymore and has been replaced by tests/expected/
Edited by Julien Sagot

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