add fatcontext (#5467)

README.md

@@ -3200,6 +3200,7 @@ _Source code analysis tools, also known as Static Application Security Testing (
 - [Chronos](https://github.com/amit-davidson/Chronos) - Detects race conditions statically
 - [dupl](https://github.com/mibk/dupl) - Tool for code clone detection.
 - [errcheck](https://github.com/kisielk/errcheck) - Errcheck is a program for checking for unchecked errors in Go programs.
+- [fatcontext](https://github.com/Crocmagnon/fatcontext) - Fatcontext detects nested contexts in loops or function literals.
 - [gcvis](https://github.com/davecheney/gcvis) - Visualise Go program GC trace data in real time.
 - [go-checkstyle](https://github.com/qiniu/checkstyle) - checkstyle is a style check tool like java checkstyle. This tool inspired by java checkstyle, golint. The style referred to some points in Go Code Review Comments.
 - [go-cleanarch](https://github.com/roblaszczak/go-cleanarch) - go-cleanarch was created to validate Clean Architecture rules, like a The Dependency Rule and interaction between packages in your Go projects.