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Fixes #38

Summary

Add last index to the sendSms function. But having problem doe to lack of experience with Go.

Details

• add last index value to the subscribe service
• add LastIndex variable to the sendSMS service
• in sendNotification point to the lastIndex variable as index to select from notification dataset
• in Handler function trying to update record in MongoDB, but having a problem: multiple-value phoneNumbersCollection.UpdateOne() in single-value context.
  -- potential solution: create new function which will connect to DB again and update values. I believe that there is a way to do that within Handler function without necessity to repeat connection to DB code, but I'm a bit lost.

Feedback and assistance very much appreciate!

Test Plan (required)

Not ready for testing

Final Checklist

• For CoronaTracker, did you bump the version in package.json?
  • Update the second decimal for a major change
  • Update the third decimal for a minor change
  • Numbers can go past 9, e.g. 1.0.9 => 1.0.10
  • For more info, read about Semantic Versioning
• Did you add any new tests as necessary?
• Is your PR rebased off the most current master?
• Have you squashed all commits? (can be done at merge)
• Did you use yarn not npm? (important!)
• Did you use Material-UI wherever possible?
• Did you run yarn lint on the code?
• Did you run all of your most recent changes locally to make sure everything is working?