update libsodium to most recent version 1.0.19
What is your Merge about?
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Updating libsodium resource to latest release.
Related Issue: #58 (closed)
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Note: Please be sure you create an issue related to this merge request and the issue is labeled ~"Hardening::Review", this will initiate a CHT member review of your merge request.
Edited by Trey Hayden