Update README.md

Author: jurgenvinju

README.md

@@ -1,6 +1,6 @@
 This is a plugin for the Rascal tutor compiler. 
 We inject this dependency later to allow for the rascal project
-to ignore the depedendency on selenium that this screenshot feature
+to ignore the dependency on selenium that this screenshot feature
 has. Also the (dynamic) dependencies on Chrome and ChromeDriver are
 encapsulated by the current module.