https://issues.dlang.org/show_bug.cgi?id=21440

          Issue ID: 21440
           Summary: PR: Add SHA-3 module as std.digest.sha3
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: dd@dax.moe

PR adding std.digest.sha3.

Github URL will follow.

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