Add webencodings to html5lib imports after upgrade

[brianhw]

Analytics Pipeline Pull Request

Make sure that the following steps are done before merging:

• [ ] If you have a migration please contact data engineering team before merging.
• [ ] Before merging run full acceptance tests suite and provide URL for the acceptance tests run.
• [ ] A member of data engineering team has approved the pull request.

[codecov[bot]]

Codecov Report

Merging #780 into master will decrease coverage by 0.01%. The diff coverage is 60%.

@@            Coverage Diff             @@
##           master     #780      +/-   ##
==========================================
- Coverage   74.17%   74.15%   -0.02%     
==========================================
  Files         209      209              
  Lines       23667    23676       +9     
==========================================
+ Hits        17555    17558       +3     
- Misses       6112     6118       +6

Impacted Files	Coverage Δ
edx/analytics/tasks/insights/problem_response.py	88.63% <100%> (+0.05%)	:arrow_up:
edx/analytics/tasks/insights/answer_dist.py	86.04% <33.33%> (+0.04%)	:arrow_up:
...asks/warehouse/load_vertica_schema_to_snowflake.py	41.3% <0%> (-4.85%)	:arrow_down:

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