Add missing access modifiers

WasmLib/Utils/BinaryReaderExtensions.cs

@@ -7,7 +7,7 @@ using WasmLib.FileFormat.Instructions;
 
 namespace WasmLib.Utils
 {
-    static class BinaryReaderExtensions
+    internal static class BinaryReaderExtensions
     {
         public static byte ReadVarUint7(this BinaryReader br)
         {

WasmLib/Utils/IDeserializable.cs

@@ -2,7 +2,7 @@ using System.IO;
 
 namespace WasmLib.Utils
 {
-    interface IDeserializable
+    internal interface IDeserializable
     {
         void Read(BinaryReader br);
     }