Fix IDiscordClient#GetInviteAsync behavior

- Previously, the GetInviteAsync method would return null since it couldn't be parsed as a simple RestInvite object. The object should be a RestInviteMetadata instead.

src/Discord.Net.Rest/ClientHelper.cs

@@ -50,7 +50,7 @@ namespace Discord.Rest
             return models.Select(x => RestConnection.Create(x)).ToImmutableArray();
         }
         
-        public static async Task<RestInvite> GetInviteAsync(BaseDiscordClient client,
+        public static async Task<RestInviteMetadata> GetInviteAsync(BaseDiscordClient client,
             string inviteId, bool withCount, RequestOptions options)
         {
             var args = new GetInviteParams
@@ -59,7 +59,7 @@ namespace Discord.Rest
             };
             var model = await client.ApiClient.GetInviteAsync(inviteId, args, options).ConfigureAwait(false);
             if (model != null)
-                return RestInvite.Create(client, null, null, model);
+                return RestInviteMetadata.Create(client, null, null, model);
             return null;
         }
         

src/Discord.Net.Rest/DiscordRestApiClient.cs

@@ -897,7 +897,7 @@ namespace Discord.API
         }
 
         //Guild Invites
-        public async Task<Invite> GetInviteAsync(string inviteId, GetInviteParams args, RequestOptions options = null)
+        public async Task<InviteMetadata> GetInviteAsync(string inviteId, GetInviteParams args, RequestOptions options = null)
         {
             Preconditions.NotNullOrEmpty(inviteId, nameof(inviteId));
             options = RequestOptions.CreateOrClone(options);
@@ -912,7 +912,7 @@ namespace Discord.API
 
             try
             {
-                return await SendJsonAsync<Invite>("GET", () => $"invites/{inviteId}", args, new BucketIds(), options: options).ConfigureAwait(false);
+                return await SendJsonAsync<InviteMetadata>("GET", () => $"invites/{inviteId}", args, new BucketIds(), options: options).ConfigureAwait(false);
             }
             catch (HttpException ex) when (ex.HttpCode == HttpStatusCode.NotFound) { return null; }
         }

src/Discord.Net.Rest/DiscordRestClient.cs

@@ -56,7 +56,7 @@ namespace Discord.Rest
             => ClientHelper.GetConnectionsAsync(this, options);
 
         /// <inheritdoc />
-        public Task<RestInvite> GetInviteAsync(string inviteId, bool withCount = false, RequestOptions options = null)
+        public Task<RestInviteMetadata> GetInviteAsync(string inviteId, bool withCount = false, RequestOptions options = null)
             => ClientHelper.GetInviteAsync(this, inviteId, withCount, options);
 
         /// <inheritdoc />

src/Discord.Net.WebSocket/BaseSocketClient.cs

@@ -55,8 +55,8 @@ namespace Discord.WebSocket
         public Task<IReadOnlyCollection<RestConnection>> GetConnectionsAsync(RequestOptions options = null)
             => ClientHelper.GetConnectionsAsync(this, options ?? RequestOptions.Default);
         /// <inheritdoc />
-        public Task<RestInvite> GetInviteAsync(string inviteId, RequestOptions options = null)
-            => ClientHelper.GetInviteAsync(this, inviteId, options ?? RequestOptions.Default);
+        public Task<RestInviteMetadata> GetInviteAsync(string inviteId, bool withCount = false, RequestOptions options = null)
+            => ClientHelper.GetInviteAsync(this, inviteId, withCount, options ?? RequestOptions.Default);
         
         // IDiscordClient
         async Task<IApplication> IDiscordClient.GetApplicationInfoAsync(RequestOptions options)
@@ -70,8 +70,8 @@ namespace Discord.WebSocket
         async Task<IReadOnlyCollection<IConnection>> IDiscordClient.GetConnectionsAsync(RequestOptions options)
             => await GetConnectionsAsync(options).ConfigureAwait(false);
 
-        async Task<IInvite> IDiscordClient.GetInviteAsync(string inviteId, RequestOptions options)
-            => await GetInviteAsync(inviteId, options).ConfigureAwait(false);
+        async Task<IInvite> IDiscordClient.GetInviteAsync(string inviteId, bool withCount, RequestOptions options)
+            => await GetInviteAsync(inviteId, withCount, options).ConfigureAwait(false);
 
         Task<IGuild> IDiscordClient.GetGuildAsync(ulong id, CacheMode mode, RequestOptions options)
             => Task.FromResult<IGuild>(GetGuild(id));