Fix link

README.md

@@ -11,7 +11,7 @@ Our course material (slides and several guides) are available as PDFs:
 - [Console Toolkit Exercises](https://gitlab.ethz.ch/thealternative/courses/blob/master/console_toolkit/exercise_files/exercises.pdf)
 - [Bash Course (Slides)](https://gitlab.ethz.ch/thealternative/courses/blob/master/bash_course/pres/pres.pdf)
 - [Bash Course (Guide)](https://gitlab.ethz.ch/thealternative/courses/blob/master/bash_course/guide/guide.pdf)
-- [Bash Course Exercises](https://gitlab.ethz.ch/thealternative/courses/blob/master/bash_course/exercisesheet/sheet.pdf) and [Solutions](https://gitlab.ethz.ch/thealternative/courses/blob/master/bash_course/exercisesheet/sheet.pdf)
+- [Bash Course Exercises](https://gitlab.ethz.ch/thealternative/courses/blob/master/bash_course/exercisesheet/sheet.pdf) and [Solutions](https://gitlab.ethz.ch/thealternative/courses/blob/master/bash_course/exercisesheet/sol.pdf)
 
 
 # Cloning the repository