Update RELEASE.md

RELEASE.md

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 Release notes
 =============
 
-This release of liboqs-python was released on August 26, 2022. Its release page on GitHub is https://github.com/open-quantum-safe/liboqs-python/releases/tag/0.7.1.
+This release of liboqs-python was released on August 26, 2022. Its release page on GitHub is https://github.com/open-quantum-safe/liboqs-python/releases/tag/0.7.2.
 
 What's New
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