DOC: fix SPEC 0 -> 8 (data-apis#191)

Author: lucascolley

README.md

@@ -11,7 +11,7 @@
 [![Conda-Forge][conda-badge]][conda-link]
 [![PyPI platforms][pypi-platforms]][pypi-link]
 [![EffVer Versioning](https://img.shields.io/badge/version_scheme-EffVer-0097a7)](https://jacobtomlinson.dev/effver)
-[![SPEC 0 — Minimum Supported Dependencies](https://img.shields.io/badge/SPEC-0-green?labelColor=%23004811&color=%235CA038)](https://scientific-python.org/specs/spec-0000/)
+[![SPEC 8 — Securing the Release Process](https://img.shields.io/badge/SPEC-8-green?labelColor=%23004811&color=%235CA038)](https://scientific-python.org/specs/spec-0008/)
 
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