Add browser support for WebAssembly

Author: buvinghausen

src/SequentialGuid/SequentialGuid.csproj

@@ -5,4 +5,8 @@
     <Description>Will generate Sequential Guids based on MongoDB's ObjectId specification. Date &amp; time are encoded into the value so you do not need to store them separately in your database.  Supports standard Guids as well as SQL Server guids.</Description>
   </PropertyGroup>
 
+  <ItemGroup>
+    <SupportedPlatform Include="browser" />
+  </ItemGroup>
+
 </Project>

src/SequentialGuid/SequentialGuidGeneratorBase.cs

@@ -27,7 +27,7 @@ protected SequentialGuidGeneratorBase()
 	{
 		_increment = new Random().Next(500000);
 		_machinePid = new byte[5];
-		using (var algorithm = MD5.Create())
+		using (var algorithm = SHA512.Create())
 		{
 			var hash = algorithm.ComputeHash(Encoding.UTF8.GetBytes(Environment.MachineName));
 			// use first 3 bytes of hash