[CSV] Use commas instead of semicolons (#236)

DiscordChatExporter.Core.Rendering/CsvChatLogRenderer.cs

@@ -81,7 +81,7 @@ namespace DiscordChatExporter.Core.Rendering
         private async Task RenderFieldAsync(TextWriter writer, string value)
         {
             var encodedValue = value.Replace("\"", "\"\"");
-            await writer.WriteAsync($"\"{encodedValue}\";");
+            await writer.WriteAsync($"\"{encodedValue}\",");
         }
 
         private async Task RenderMessageAsync(TextWriter writer, Message message)
@@ -120,4 +120,4 @@ namespace DiscordChatExporter.Core.Rendering
                 await RenderMessageAsync(writer, message);
         }
     }
-}
+}