Update README.md

removed dead link (* [**C**: _Writing a shell in C_](https://prakashdanish.github.io/2018/01/15/write-a-shell.html))

README.md

@@ -322,7 +322,6 @@
 * [**C**: _Let's build a shell!_](https://github.com/kamalmarhubi/shell-workshop)
 * [**C**: _Writing a UNIX Shell_](https://indradhanush.github.io/blog/writing-a-unix-shell-part-1/)
 * [**C**: _Build Your Own Shell_](https://github.com/tokenrove/build-your-own-shell)
-* [**C**: _Writing a shell in C_](https://prakashdanish.github.io/2018/01/15/write-a-shell.html)
 * [**Go**: _Writing a simple shell in Go_](https://sj14.gitlab.io/post/2018-07-01-go-unix-shell/)
 * [**Ruby**: _A Unix Shell in Ruby_](https://www.jstorimer.com/blogs/workingwithcode/7766107-a-unix-shell-in-ruby)