NuGet Package Clean Up

[AdrianJSClark]

As a result of checking against "Ensuring best practices for NuGet Packages" by meziantou / Gerald Barre, fix up the following:

• [x] #151
• [x] #152
• [x] #153

[AdrianJSClark]

Running the validation tool written by meziantou across release 0.8.0 reveals no issues.

PS C:\Dev\Temp> meziantou.validate-nuget-package aydsko.iracingdata.0.8.0.nupkg
{
  "IsValid": true,
  "Packages": {
    "C:\\Dev\\Temp\\aydsko.iracingdata.0.8.0.nupkg": {
      "Errors": [],
      "IsValid": true
    }
  }
}