Change script encoding to UTF-8 with BOM (lptstr#135)

Fixes PowerShell 5.x compatibility

Author: Alex Stelmachonak

winfetch.ps1

@@ -1,6 +1,8 @@
-#!/usr/bin/env -S pwsh -nop
+#!/usr/bin/env -S pwsh -nop
 #requires -version 5
 
+# (!) This file must to be saved in UTF-8 with BOM encoding in order to work with legacy Powershell 5.x
+
 <#PSScriptInfo
 .VERSION 2.4.0
 .GUID bfcfe9f2-ad01-460b-a0b8-434b8254d00f