404 in PS script

Scripts to install openssl on windows fail due to 404.

Need a new source , or perhaps host it somewhere more reliable.

@takethisusernameidareyou I fixed the issue in PR #20. Still waiting for approval.
You can grab my version from here: https://github.com/DropNib/unattended-setup-scripts/blob/dynamic-openssl-fetch/SetupWinRMAccessSelfSigned.ps1