fix: cannot install Raven in Windows via powershell 5.1

[Aleegra]

Summary

When you run install command in Powershell 5.1, there will be an error: Permanent Redirect to lead install failing.

Steps to reproduce

1. Run "irm https://raven.evermind.ai/install.ps1 | iex" in Windows Powershell 5.1

Expected behavior

Raven should be installed

Actual behavior

Get error: "PS C:\Users\User> irm https://raven.evermind.ai/install.ps1 | iex irm : Permanent Redirect. 所在位置 行:1 字符: 1 + irm https://raven.evermind.ai/install.ps1 | iex + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod]，WebException + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand""

Environment

OS: Windows 10专业版

Logs or screenshots