[Snyk] Upgrade sequelize from 5.21.1 to 5.21.2

[snyk-bot]

Snyk has created this PR to upgrade sequelize from 5.21.1 to 5.21.2.

• The recommended version is 2 versions ahead of your current version.
• The recommended version was released 8 days ago, on 2019-10-29.

Release notes

• Package name: sequelize
  • 5.21.2 - 2019-10-29

    5.21.2 (2019-10-29)

    Bug Fixes

    • typings: transaction locking (#11621) (6c781d6)
  • 5.21.1 - 2019-10-19

    5.21.1 (2019-10-19)

    Bug Fixes

    • associations: allow binary key for belongs-to-many (#11581) (2083c9a)
from sequelize GitHub release notes

------------

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[codecov-io]

Codecov Report

Merging #78 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #78   +/-   ##
=======================================
  Coverage   63.84%   63.84%           
=======================================
  Files          83       83           
  Lines        2293     2293           
  Branches      382      382           
=======================================
  Hits         1464     1464           
  Misses        812      812           
  Partials       17       17

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