typo fix

.gitlab-ci.yml

@@ -20,7 +20,7 @@ build and upload the contents:
     - chmod 700 /root/.ssh
     - ssh-keyscan tnw-tn1.tudelft.net >> /root/.ssh/known_hosts
     - chmod 644 /root/.ssh/known_hosts
-    - npm install gitbook
+    - npm install gitbook-cli -g
 
   script:
     # Compile lectures