Update README.md

Update specification link to point to 2.1
idaholab · Jun 15, 2021 · 4f9089a · 4f9089a
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@@ -8,6 +8,6 @@ See the [STIG Innovation Sheet](18-179_STIG_Innovation_Sheet.pdf) for an overvie
 
 For installation and usage instructions, see our [documentation](https://stig.readthedocs.io/en/latest/).
 
-The STIX version 2 specification can be found at **<http://docs.oasis-open.org/cti/stix/v2.0/stix-v2.0-part1-stix-core.html>**.
+The STIX version 2.1 specification can be found at **<https://oasis-open.github.io/cti-documentation/resources>**.
 An introduction and walk through of STIX can be found at **<https://oasis-open.github.io/cti-documentation/stix/intro.html>**, and **<https://oasis-open.github.io/cti-documentation/stix/walkthrough.html>**.