update README

Author: pantheraleo-7

README.md

@@ -6,25 +6,36 @@ This code was published in relation to a [blog post](https://pimylifeup.com/rasp
 
 ## Installation
 
-Until the package is on PyPi, clone this repository and run `python setup.py install` in the top level directory.
+The package is available on PyPI.
+```shell
+pip install mfrc522
+```
+
+To build from source, clone this repository and run the setup script inside the top level directory.
+```shell
+git clone https://github.com/pimylifeup/MFRC522-python
+cd MFRC522-python
+python setup.py install
+```
 
 ## Example Code
 
 The following code will read a tag from the MFRC522
 
 ```python
-from time import sleep
-import sys
+import time
+
 from mfrc522 import SimpleMFRC522
+
+
 reader = SimpleMFRC522()
 
 try:
     while True:
         print("Hold a tag near the reader")
         id, text = reader.read()
-        print("ID: %s\nText: %s" % (id,text))
-        sleep(5)
-except KeyboardInterrupt:
-    GPIO.cleanup()
-    raise
+        print(f"{id =}\n{text =}")
+        time.sleep(5)
+finally:
+    reader.cleanup()
 ```