Fixed bugs with creating invites

src/Discord.Net.Rest/Entities/Channels/ChannelHelper.cs

@@ -74,8 +74,12 @@ namespace Discord.Rest
             var args = new CreateChannelInviteParams { IsTemporary = isTemporary };
             if (maxAge.HasValue)
                 args.MaxAge = maxAge.Value;
+            else
+                args.MaxAge = 0;
             if (maxUses.HasValue)
                 args.MaxUses = maxUses.Value;
+            else
+                args.MaxUses = 0;
             var model = await client.ApiClient.CreateChannelInviteAsync(channel.Id, args, options).ConfigureAwait(false);
             return RestInviteMetadata.Create(client, null, channel, model);
         }

src/Discord.Net.Rest/Entities/Channels/RestGuildChannel.cs

@@ -118,7 +118,7 @@ namespace Discord.Rest
 
         public async Task<IReadOnlyCollection<RestInviteMetadata>> GetInvitesAsync(RequestOptions options = null)
             => await ChannelHelper.GetInvitesAsync(this, Discord, options).ConfigureAwait(false);
-        public async Task<RestInviteMetadata> CreateInviteAsync(int? maxAge = 3600, int? maxUses = null, bool isTemporary = true, RequestOptions options = null)
+        public async Task<RestInviteMetadata> CreateInviteAsync(int? maxAge = 3600, int? maxUses = null, bool isTemporary = false, RequestOptions options = null)
             => await ChannelHelper.CreateInviteAsync(this, Discord, maxAge, maxUses, isTemporary, options).ConfigureAwait(false);
 
         public override string ToString() => Name;

src/Discord.Net.Rpc/Entities/Channels/RpcGuildChannel.cs

@@ -51,7 +51,7 @@ namespace Discord.Rpc
 
         public async Task<IReadOnlyCollection<RestInviteMetadata>> GetInvitesAsync(RequestOptions options = null)
             => await ChannelHelper.GetInvitesAsync(this, Discord, options).ConfigureAwait(false);
-        public async Task<RestInviteMetadata> CreateInviteAsync(int? maxAge = 3600, int? maxUses = null, bool isTemporary = true, RequestOptions options = null)
+        public async Task<RestInviteMetadata> CreateInviteAsync(int? maxAge = 3600, int? maxUses = null, bool isTemporary = false, RequestOptions options = null)
             => await ChannelHelper.CreateInviteAsync(this, Discord, maxAge, maxUses, isTemporary, options).ConfigureAwait(false);
 
         public override string ToString() => Name;

src/Discord.Net.WebSocket/Entities/Channels/SocketGuildChannel.cs

@@ -112,7 +112,7 @@ namespace Discord.WebSocket
 
         public async Task<IReadOnlyCollection<RestInviteMetadata>> GetInvitesAsync(RequestOptions options = null)
             => await ChannelHelper.GetInvitesAsync(this, Discord, options).ConfigureAwait(false);
-        public async Task<RestInviteMetadata> CreateInviteAsync(int? maxAge = 3600, int? maxUses = null, bool isTemporary = true, RequestOptions options = null)
+        public async Task<RestInviteMetadata> CreateInviteAsync(int? maxAge = 3600, int? maxUses = null, bool isTemporary = false, RequestOptions options = null)
             => await ChannelHelper.CreateInviteAsync(this, Discord, maxAge, maxUses, isTemporary, options).ConfigureAwait(false);
 
         public new abstract SocketGuildUser GetUser(ulong id);