Update README.md

Author: Foso

README.md

@@ -24,7 +24,7 @@ Into this:
 ## Introduction / HOW TO USE
 
 1) Put your cursor to the place where you want to insert the Compose code.
-2) Open the Plugin unter Tools> HTML to Compose Web
+2) Open the Plugin under Tools> HTML to Compose Web
  <p align="center">
   <img src ="https://raw.githubusercontent.com/Foso/HtmlToComposeWebConverter/blob/master/docs/ideatools.png" height=500 />
 </p>