Remove stale release notes from README

[whereswaldon]

New users coming to the project could incorrectly assume that the project is pre-1.0 release and that it hasn't had a release in years if they assumed that the release notes in the README were up-to-date. I say this because I assumed that on my first read.

[CLAassistant]

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[whereswaldon]

Finally remembered to circle back on that CLA.