Add status note and cleanup 2 leftover files

[r0man]

This PR adds a note about the status of the library and removes 2 leftover files.

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• [x] The commits are consistent with our contribution guidelines
• [x] You've added tests (if possible) to cover your change(s)
• [x] All tests are passing (run lein do clean, test)
• [-] You've updated the changelog (if adding/changing user-visible functionality)
• [x] You've updated the readme (if adding/changing user-visible functionality)

Thanks!

[vemv]

Thanks!

@bbatsov , could you please add CLOJARS_USERNAME / CLOJARS_PASSWORD to https://app.circleci.com/pipelines/github/clojure-emacs/logjam ?

[bbatsov]

Done.

[vemv]

Thanks!

@r0man , I've tagged 0.1.1 so https://clojars.org/mx.cider/logjam/versions/0.1.1 is available for your convenience.

...On a related note, I tentatively restricted tagging:

It should be a good idea to review security aspects in our org soon.