Updating jquery and fullcalendar

[noahmanger]

This updates jQuery to the latest version. In my testing, however, I quickly discovered the calendar was broken, and learned that the library we use for it added support for jQuery 3 in 2.8.0, so I updated that library as well.

Everything seems to work now, but again, another set of eyes wouldn't hurt.

[ccostino]

D'oh, looks like we still have a test failure, but that's because of the fec-style update needed first with 18F/fec-style#686, right @noahmanger?

[noahmanger]

That's my best bet, because I can't think of any other reason this would fail. The tests pass locally for me.

[codecov-io]

Codecov Report

Merging #1021 into develop will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           develop   #1021      +/-   ##
==========================================
+ Coverage    62.77%   62.8%   +0.03%     
==========================================
  Files          172     172              
  Lines         4873    4877       +4     
  Branches       375     375              
==========================================
+ Hits          3059    3063       +4     
+ Misses        1797    1795       -2     
- Partials        17      19       +2

Impacted Files	Coverage Δ
fec/home/templates/home/calendar.html	100% <0%> (ø)	⬆️
...ader/management/commands/import_meeting_agendas.py	0% <0%> (ø)	⬆️
...ader/management/commands/scrape_meeting_agendas.py	0% <0%> (ø)	⬆️
fec/fec/templates/base.html	83.26% <0%> (+0.19%)	⬆️

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