Added requirements.txt. Started adding logic to pull latest version from git.

main.py

@@ -1,5 +1,5 @@
 import reprlib
-
+import os
 import requests
 
 # payload = {'isbn': '9780062113788'}
@@ -37,7 +37,8 @@ while True:
     elif command == 'CARD':
         Card = 1
     elif command == 'UPDATE':
-        pass
+        os.system('cd ~/libraryClient')
+        os.system('git pull')
     elif command == '':
         pass
     else:

requirements.txt

@@ -0,0 +1,5 @@
+certifi==2021.5.30
+chardet==4.0.0
+idna==2.10
+requests==2.25.1
+urllib3==1.26.5