Check for upates on GitHub form Unity Editor

CheckForUpdates.cs

private const string LatestReleaseApiURL = "https://api.github.com/repos/getsocial-im/getsocial-unity-sdk/releases/latest";
private const string LatestReleaseURL = "https://github.com/getsocial-im/getsocial-unity-sdk/releases/latest";

[MenuItem(GetSocialMenuParent + "GetSocial/Check for Updates...", false, priority: 2000)]
public static void CheckForUpdates()
{
    CheckForUpdatesOnReleaseRepo();
}

private static void CheckForUpdatesOnReleaseRepo()
{
    HttpWebRequest request = WebRequest.Create(LatestReleaseApiURL) as HttpWebRequest;

    request.Method = "GET";
    request.UserAgent = "Unity Editor";
    request.Proxy = null;
    request.KeepAlive = false;
    request.Accept = "application/vnd.github.v3+json";

    using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
    {
        using (StreamReader reader = new StreamReader(response.GetResponseStream()))
        {
            string jsonResponse = reader.ReadToEnd().ToString();
            var lastVersionTag = new JSONObject(jsonResponse).GetField("tag_name").str;
            ShowUpdateDialog(lastVersionTag);
        }
    }
}

private static void ShowUpdateDialog(string lastVersionTag)
{
    var dialogTitle = "Update GetSocial SDK";
    if(IsInstalledVersionLatest(lastVersionTag))
    {
        EditorUtility.DisplayDialog(dialogTitle, "You already have the latest version installed (" + lastVersionTag + ")", "OK");
    }
    else
    {
        var downloadUpdate = EditorUtility.DisplayDialog(dialogTitle, 
                                string.Format("[GetSocial] plugin {0} is now available!", lastVersionTag), "Download Update", "Cancel");
        if(downloadUpdate)
        {
            Application.OpenURL(LatestReleaseURL);
        }
    }
}