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.
 
-- Link to the first blog post—[CodeQL zero to hero part 1: the fundamentals of static analysis for vulnerability research](https://github.blog/2023-03-31-codeql-zero-to-hero-part-1-the-fundamentals-of-static-analysis-for-vulnerability-research/). The [challenges accompanying the blog post are in folder 1.](https://github.com/GitHubSecurityLab/codeql-zero-to-hero/tree/main/1)
-- Link to the second blog post—[CodeQL zero to hero part 2: getting started with CodeQL](https://github.blog/2023-06-15-codeql-zero-to-hero-part-2-getting-started-with-codeql/). The [challenges accompanying the blog post are in folder 2.](https://github.com/GitHubSecurityLab/codeql-zero-to-hero/tree/main/2)
-- Link to the third blog post-CodeQL zero to hero part 3: security research. The challenges accompanying the blog post are in folder 2.
+- Link to the first blog post—[CodeQL zero to hero part 1: the fundamentals of static analysis for vulnerability research](https://github.blog/2023-03-31-codeql-zero-to-hero-part-1-the-fundamentals-of-static-analysis-for-vulnerability-research/). The challenges accompanying the blog post are in [folder 1.](https://github.com/GitHubSecurityLab/codeql-zero-to-hero/tree/main/1)
+- Link to the second blog post—[CodeQL zero to hero part 2: getting started with CodeQL](https://github.blog/2023-06-15-codeql-zero-to-hero-part-2-getting-started-with-codeql/). The challenges accompanying the blog post are in [folder 2.](https://github.com/GitHubSecurityLab/codeql-zero-to-hero/tree/main/2)
+- Link to the third blog post—[CodeQL zero to hero part 3: security research](https://github.blog/2024-04-29-codeql-zero-to-hero-part-3-security-research-with-codeql/). The challenges accompanying the blog post are in [folder 3](https://github.com/GitHubSecurityLab/codeql-zero-to-hero/tree/main/3).