chore: lint fixes

src/containers/CourseList/index.jsx

@@ -1,13 +1,17 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 
 import CourseCard from 'containers/CourseCard';
 
 export const CourseList = ({ courseIDs }) => (
-  <div className='d-flex flex-column flex-grow-1'>
+  <div className="d-flex flex-column flex-grow-1">
     {courseIDs.map((id) => (
       <CourseCard courseID={id} />
     ))}
   </div>
 );
+CourseList.propTypes = {
+  courseIDs: PropTypes.arrayOf(PropTypes.string).isRequired,
+};
 
 export default CourseList;