Update readme.md

Signed-off-by: Adrian <[email protected]>

Author: adrian2793

readme.md

@@ -20,6 +20,8 @@
 ```
 **Description** Enable or disable `SerialMonitor`
 
+---
+
 ```ino
 SerialMonitor serial;
 ```
@@ -28,6 +30,8 @@ SerialMonitor serial;
 **Parameters**
 * `serial` Name of the class without spaces
 
+---
+
 ```ino
 Serial.begin(9600);
 ```
@@ -43,6 +47,8 @@ serial.initialize();
 **Parameters**
 * `serial` Name of a declared class
 
+---
+
 ```ino
 if(serial.initialize() == true) {
   // Your code goes here