[bugfix] powershell6 does not support Set-Prompt

win/profile.ps1

@@ -6,7 +6,10 @@
 Set-PSReadLineOption -EditMode Emacs
 $Env:Path += ";$PSScriptRoot\bin"
 Set-Alias -Name k kubectl
-Set-Prompt
+$isPs7 = $host.Version.Major -ge 7
+if ( $isPs7 ) {
+    Set-Prompt
+}
 
 function kcc { k config get-contexts $args }
 function kcu { k config use-context $args}
@@ -70,4 +73,4 @@ function ssh-copy-id {
   )
 
   Get-Content $IdentityFile | ssh $UserHost "umask 077; mkdir -p .ssh ; cat >> .ssh/authorized_keys"
-}
+}