Update README.md (#5319)
Update README.md (#5319)

Summary:
Pull Request resolved: https://github.com/facebook/osquery/pull/5319

* Remove Jenkins build status and simplify the text.

Reviewed By: guliashvili

Differential Revision: D13431121

fbshipit-source-id: c058c1588ee58fd89cc15f37b242662929f6b611

hackgnar/osquery,hackgnar/osquery,hackgnar/osquery