Major package maintenance in v0.2.0

• Find-git-repositories was rewritten to leverage n-api to future proof the module.
• The package is now exclusively written in C++ without shipping any Javascript.
• Module now supports only node versions listed as compatible with version 4 of n-api. See this chart for help. This officially drops support for versions of node less than v8.16.0, v10.16.0, and v12.0.0. As this package's functionality rarely changes, efforts will not be made to reverse this decision. Please use v0.1.3 if you absolutely need support below the listed ranges as this release does not introduce functional changes.