Powershell syntax now supported by ALE (Vim) plugin

[ALE][1] project has approved my PR to show powershell syntax errors by parsing
the powershell by powershell itself. If the current buffer has a filetype of
Powershell, the buffer is run through the following powershell script to check
for syntax errors. Errors are then displayed in Vim by ALE:

---

            Param($Script)
            trap {$_; continue } & {
                $Contents = Get-Content -Path $Script;
                $Contents = [string]::Join([Environment]::NewLine, $Contents);
                [void]$ExecutionContext.InvokeCommand.NewScriptBlock($Contents);
            }; 

Tags: ale, vim, powershell

[1]:https://github.com/w0rp/ale
