add os parameter by plans.listPlans and fix url by startupScripts

[apeters1827]

No description provided.

[codecov]

Codecov Report

Merging #460 (e12b933) into master (502e561) will not change coverage.
The diff coverage is n/a.

❗ Current head e12b933 differs from pull request most recent head 25931a8. Consider uploading reports for the commit 25931a8 to get more accurate results

@@           Coverage Diff           @@
##           master     #460   +/-   ##
=======================================
  Coverage   99.29%   99.29%           
=======================================
  Files          24       24           
  Lines         283      283           
  Branches       26       26           
=======================================
  Hits          281      281           
  Misses          2        2           

Impacted Files	Coverage Δ
src/api/plans.js	100.00% <ø> (ø)
src/api/startup-scripts.js	100.00% <ø> (ø)

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[ddymko]

@spencerkordecki the OS field for plans was recently added as a new query param to get plans specific for windows

https://www.vultr.com/api/#operation/list-plans

[ddymko]

@gabos31 Thanks for going through and patching bugs you come across