libbpf-tools: update README add a blog link
@@ -3,6 +3,7 @@ Useful links
- [BPF Portability and CO-RE](https://facebookmicrosites.github.io/bpf/blog/2020/02/19/bpf-portability-and-co-re.html)
- [HOWTO: BCC to libbpf conversion](https://facebookmicrosites.github.io/bpf/blog/2020/02/20/bcc-to-libbpf-howto-guide.html)
+- [Tips & tricks for writing libbpf-tools](https://en.pingcap.com/blog/tips-and-tricks-for-writing-linux-bpf-applications-with-libbpf)
Building
-------
