Update README.md

Author: sylwia-budzynska

README.md

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 This repository contains challenges for the CodeQL Zero to Hero blog post series.
 
-See the first blog post [here](https://github.blog/2023-03-31-codeql-zero-to-hero-part-1-the-fundamentals-of-static-analysis-for-vulnerability-research/). The challenges for this blog post are available in [folder 1](https://github.com/sylwia-budzynska/codeql-zero-to-hero/tree/main/1).
+* First blog post [here](https://github.blog/2023-03-31-codeql-zero-to-hero-part-1-the-fundamentals-of-static-analysis-for-vulnerability-research/). The challenges for this blog post are available in [folder 1](https://github.com/sylwia-budzynska/codeql-zero-to-hero/tree/main/1).
+* Second blog post [here](https://github.blog/2023-06-15-codeql-zero-to-hero-part-2-getting-started-with-codeql/). The challenges are in [folder 2](https://github.com/GitHubSecurityLab/codeql-zero-to-hero/tree/main/2)https://github.com/GitHubSecurityLab/codeql-zero-to-hero/tree/main/2.