Backup Schedule : pointers on fields

[ddymko]

Description

Backup Schedules allow the use of 0 as a valid field for Hour + Day of week. Changing these fields in the struct to be pointers to int.

Related Issues

Checklist:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you linted your code locally prior to submission?
• Have you successfully ran tests with your changes locally?

[codecov]

Codecov Report

Merging #145 (3f14abf) into master (b1629b5) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #145   +/-   ##
=======================================
  Coverage   54.43%   54.43%           
=======================================
  Files          23       23           
  Lines        1194     1194           
=======================================
  Hits          650      650           
  Misses        279      279           
  Partials      265      265           

Impacted Files	Coverage Δ
instance.go	55.74% <ø> (ø)
govultr.go	90.69% <100.00%> (ø)

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