Fix for credentials reading from file, adjusted client options base adress to always end on a /

CryptoExchange.Net/Authentication/ApiCredentials.cs

@@ -80,7 +80,7 @@ namespace CryptoExchange.Net.Authentication
         /// <param name="identifierSecret">A key to identify the credentials for the API. For example, when set to `binanceSecret` the json data should contain a value for the property `binanceSecret`. Defaults to 'apiSecret'.</param>
         public ApiCredentials(Stream inputStream, string? identifierKey = null, string? identifierSecret = null)
         {
-            using var reader = new StreamReader(inputStream, Encoding.ASCII, false, 512, true);
+            using var reader = new StreamReader(inputStream, Encoding.UTF8, false, 512, true);
             
             var stringData = reader.ReadToEnd();
             var jsonData = stringData.ToJToken();

CryptoExchange.Net/Objects/Options.cs

@@ -76,10 +76,22 @@ namespace CryptoExchange.Net.Objects
     /// </summary>
     public class ClientOptions : BaseOptions
     {
+        private string _baseAddress;
+
         /// <summary>
         /// The base address of the client
         /// </summary>
-        public string BaseAddress { get; set; }
+        public string BaseAddress
+        {
+            get => _baseAddress;
+            set
+            {
+                var newValue = value;
+                if (!newValue.EndsWith("/"))
+                    newValue += "/";
+                _baseAddress = newValue;
+            }
+        }
 
         /// <summary>
         /// The api credentials