Bump version number up to 2.18.0 and update change log and README #321

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[notice] A new release of pip is available: 21.1.1 -> 24.2 [notice] To update, run: python3.8 -m pip install --upgrade pip

nettle 3.10 is already installed and up-to-date. To reinstall 3.10, run: brew reinstall nettle

libsodium 1.0.20 is already installed and up-to-date. To reinstall 1.0.20, run: brew reinstall libsodium

openssl@3 3.3.2 is already installed and up-to-date. To reinstall 3.3.2, run: brew reinstall openssl@3