deprecate the optional AllowAutoRedirect parameter

Octokit/Http/HttpClientAdapter.cs

@@ -104,7 +104,6 @@ namespace Octokit.Internal
                 var fullUri = new Uri(request.BaseAddress, request.Endpoint);
                 requestMessage = new HttpRequestMessage(request.Method, fullUri);
 
-                requestMessage.Properties["AllowAutoRedirect"] = request.AllowAutoRedirect;
                 foreach (var header in request.Headers)
                 {
                     requestMessage.Headers.Add(header.Key, header.Value);
@@ -166,7 +165,6 @@ namespace Octokit.Internal
 
     internal class RedirectHandler : DelegatingHandler
     {
-        public const string AllowAutoRedirectKey = "AllowAutoRedirect";
         public const string RedirectCountKey = "RedirectCount";
         public bool Enabled { get; set; }
 
@@ -177,10 +175,6 @@ namespace Octokit.Internal
             // Can't redirect without somewhere to redirect too.  Throw?
             if (response.Headers.Location == null) return response;
 
-            // Don't redirect if redirection has been disabled for this request
-            var allowAutoRedirect = (bool)request.Properties[AllowAutoRedirectKey];
-            if (!allowAutoRedirect) return response; // Throw?
-
             // Don't redirect if we exceed max number of redirects
             var redirectCount = 0;
             if (request.Properties.Keys.Contains(RedirectCountKey))