README.md file is updated.

README.md

@@ -2,8 +2,10 @@
 
 This package provides simplified way to invoke **stty** utility to perform some
 tasks by means of it. For now the only a few number of functions are implemented:
-set tty baudrate, check tty baudrate and test if selected baudrate is available
-for some tty. 
+- set tty baudrate 
+- check tty baudrate 
+- test if selected baudrate is available for some tty
+- test if a given file is a tty
 
 -------------
 
@@ -20,16 +22,16 @@ import (
 )
 ```
 
-3. Create new stty object by means of **Get()** function:
+3. Test if some file is a tty:
 ```go
-    sttyControl, err := stty.Get()
+    err := stty.ValidateTtyFile("/dev/ttyUSB0")
 ```
 
-If **stty** is unavailable at the current system this function will
-return an error.
-
 4. Use stty object to perform some tasks. For instance, test if baudrate of 9600
 is available at **/dev/ttyUSB0**: 
 ```go
-    ok, err := sttyControl.TestBaudRate("/dev/ttyUSB0", 9600)
-```
+    err := stty.CMD().TestBaudRate("/dev/ttyUSB0", 9600)
+```
+
+If **stty** is not available stty, all methods of object returned by CMD() function 
+will return ERR_TTY_MISSING error.