feat: support Powershell 5

packages/powershell/oh-my-posh/oh-my-posh.psd1

@@ -21,7 +21,7 @@
     # Description of the functionality provided by this module
     Description       = 'A prompt theme engine for any shell'
     # Minimum version of the Windows PowerShell engine required by this module
-    PowerShellVersion = '6.0'
+    PowerShellVersion = '5.0'
     # List of all files packaged with this module
     FileList          = @()
     # Cmdlets to export from this module

packages/powershell/oh-my-posh/oh-my-posh.psm1

@@ -20,7 +20,7 @@ function Get-PoshCommand {
 }
 
 # Set the right binary to executable before doing anything else
-if (!$IsWindows) {
+if ($PSVersionTable.PSEdition -eq "Core" -and !$IsWindows) {
     $executable = Get-PoshCommand
     Invoke-Expression -Command "chmod +x $executable"
 }