#159328959 Add daily diary update reminder feature

[olusoladavid]

What does this PR do?

Completes a new feature which enables users to receive daily reminders to update their diary via push notifications

Description of Task to be completed

• Add tests for feature
• Implement feature to be able to run in stand-alone mode

How should this be manually tested?

• Pull branch into local machine
• Authenticate a push enabled client at https://olusoladavid.github.io/my-diary-client and subscribe for push notifications on the user profile
• cd my-diary
• Run node server/workers/sendNotifications.js with a valid push subscription
• Receive notification in client

What are the relevant pivotal tracker stories?

#159328959

[coveralls]

Pull Request Test Coverage Report for Build 138

• 18 of 18 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 136:	0.0%
Covered Lines:	180
Relevant Lines:	180

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💛 - Coveralls