docs: update install URL to v2.1.6 [skip ci]

Author: github-actions[bot]

README.md

@@ -33,7 +33,7 @@ Start shipping systematically with Spec-Driven Development, Skills, TDD, Semanti
 Run this shell command in **any project directory** for a **fresh install** or to **update to the latest version**:
 
 ```bash
-curl -sSL https://raw.githubusercontent.com/maxritter/claude-codepro/v2.1.5/scripts/install.sh | bash
+curl -sSL https://raw.githubusercontent.com/maxritter/claude-codepro/v2.1.6/scripts/install.sh | bash
 ```
 
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