Fixed csproj's reference to HttpException

src/Discord.Net.Net45/Discord.Net.csproj

@@ -88,9 +88,6 @@
     <Compile Include="..\Discord.Net\Helpers\Http.cs">
       <Link>Helpers\Http.cs</Link>
     </Compile>
-    <Compile Include="..\Discord.Net\Helpers\HttpException.cs">
-      <Link>Helpers\HttpException.cs</Link>
-    </Compile>
     <Compile Include="..\Discord.Net\Invite.cs">
       <Link>Invite.cs</Link>
     </Compile>
@@ -112,6 +109,7 @@
     <Compile Include="..\Discord.Net\User.cs">
       <Link>User.cs</Link>
     </Compile>
+    <Compile Include="HttpException.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

src/Discord.Net.Net45/HttpException.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Net;
+
+namespace Discord
+{
+	public class HttpException : Exception
+	{
+		public HttpStatusCode StatusCode { get; }
+
+		public HttpException(HttpStatusCode statusCode)
+			: base($"The server responded with error {statusCode}")
+        {
+			StatusCode = statusCode;
+        }
+	}
+}