fixing some linter errors

Author: nielsdrost

_episodes/02-installation.md

@@ -3,14 +3,14 @@ title: "Installation"
 teaching: 10
 exercises: 20
 questions:
-  - "What are the prerequisites for installing ESMValTool?"
-  - "How do I confirm that the installation was successful?"
+- "What are the prerequisites for installing ESMValTool?"
+- "How do I confirm that the installation was successful?"
 objectives:
-  - "Install ESMValTool"
-  - "Demonstate that the installation was successful"
+- "Install ESMValTool"
+- "Demonstate that the installation was successful"
 keypoints:
-  - "All the required packages can be installed using conda"
-  - "You can find more information about installation in the documentation"
+- "All the required packages can be installed using conda"
+- "You can find more information about installation in the documentation"
 ---
 ## Overview