fix(isRunning)

I was having issues starting the server. I couldn't get valid response with tasklist /fi. This is what I ended up using

return `powershell -NoProfile -ExecutionPolicy Bypass -Command "$p = Get-Process -Name jmp -ErrorAction SilentlyContinue; if ($p) { 'jmp.exe' }; exit 0"`;

and

const latestVersion = 19;