Bump Celery to 4.0

[jaywink]

No description provided.

[pep8speaks]

Hello @jaywink! Thanks for submitting the PR.

• In the file config/settings/common.py, following are the PEP8 issues :

Line 238:11: E225 missing whitespace around operator
Line 239:11: E225 missing whitespace around operator
Line 240:9: E225 missing whitespace around operator

• Complete extra results for this file :

3 E225 missing whitespace around operator
1 E266 too many leading '#' for block comment

---

• There are no PEP8 issues in the file config/settings/local.py !

• Complete extra results for this file :

2 E266 too many leading '#' for block comment

---

• There are no PEP8 issues in the file socialhome/taskapp/celery.py !

[pep8speaks]

Hello @jaywink! Thanks for updating the PR.

• There are no PEP8 issues in the file config/settings/common.py !

• There are no PEP8 issues in the file config/settings/local.py !

• Complete extra results for this file :

2 E266 too many leading '#' for block comment

---

• There are no PEP8 issues in the file socialhome/taskapp/celery.py !

[codecov-io]

Current coverage is 96.42% (diff: 100%)

Merging #85 into master will not change coverage

@@             master        #85   diff @@
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  Files            31         31          
  Lines           868        868          
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
  Hits            837        837          
  Misses           31         31          
  Partials          0          0          

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