Lb updates

[ddymko]

Description

Adding the new functionality for the LB api to govultr

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 #62 into master will increase coverage by 0.08%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
+ Coverage   72.00%   72.08%   +0.08%     
==========================================
  Files          24       24              
  Lines        2668     2683      +15     
==========================================
+ Hits         1921     1934      +13     
- Misses        376      377       +1     
- Partials      371      372       +1     

Impacted Files	Coverage Δ
load_balancer.go	73.70% <87.50%> (+0.70%)	⬆️

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