Fixing the issue with html tag change

[yeguang-xue]

Fixing the issue with HTML tag change (from span to div).

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Proposed changes

The bug due to HTML tag change in the website is fixed.

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• I have read the CONTRIBUTING doc
• I agree to contribute my changes under the project's LICENSE
• I have checked that the unit tests pass locally with my changes
• I have checked the style of the new code (lint/pep).
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

This just involves change of a single line for bug fixing.

Reviewers

N/A

[coveralls]

Coverage remained the same at 48.016% when pulling c5140a7 on blackholexyg:patch-html-tag-change into 55f6e51 on coursera-dl:master.