added link in sed section

session2.md

@@ -63,7 +63,7 @@ Refer [A find Tutorial and Primer](https://danielmiessler.com/study/find/)
 
 ## Find and Replace
 ### sed
-Refer [Ultimate Sed Tutorial With Examples](https://www.poftut.com/ultimate-sed-tutorial-with-examples/)
+Refer [Ultimate Sed Tutorial With Examples](https://www.poftut.com/ultimate-sed-tutorial-with-examples/) and [The Regex warrior: transform a text file in <2 mins](https://blog.theodo.com/2018/03/regex-warrior/)
 > Pirate Praveen:
 > I had to use `sed` with some js packages to modify the final built files like adding some lines at the end so that it becomes compatible
 >