Powershell: Updatable help for PowerShellGet 3.0.0-x

[alerickson]

Expected behavior

Updatable help for PowerShellGet should now include the new functionality for:

• Find-PSResource
• Get-PSResourceRepository
• Get-PSResource
• Install-PSResource
• Register-PSResourceRepository
• Save-PSResource
• Set-PSResourceRepository
• Publish-PSResource
• Uninstall-PSResource
• Unregister-PSResourceRepository
• Update-PSResource

Actual behavior

Currently includes updatable help for PowerShellGet 2.x.x functions.

Environment data

This applies to all versions of PowerShell.

[iSazonov]

/cc @sdwheeler