Update README-Nuget.md

Author: ShayanFiroozi

README-Nuget.md

@@ -21,7 +21,7 @@
                                                .DeleteTheLogFileWhenExceededTheMaximumSizeOf(20)
                                                .PrintOnConsole();
  ```   
-> ℹ **Note**:  
+> ❕ **Note**:  
 > Internal logger agent is responsible for logging the events occured in the FastLog.Net internally (including exceptions).   
  
   **Step 2** 👇  
@@ -32,7 +32,7 @@
                                            .WithLoggerName("FastLog.Net® Logger")
                                            .WithMaxEventsToKeepInMemory(1_000);
  ```   
-> ℹ **Note**:  
+> ❕ **Note**:  
 > There is "**RunAgentsInParallelMode**" feature you can use to run agent(s) in parallel , but in most cases it's **NOT** recommended because may have considerable negative impact on performance.  
  
   **Step 3** 👇