libbpf-tools: update README add a blog link

Signed-off-by: Wenbo Zhang <ethercflow@gmail.com>
iovisor · Dec 17, 2020 · 39eb601 · 39eb601
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diff --git a/libbpf-tools/README.md b/libbpf-tools/README.md
@@ -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
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