Only refresh the mfa key on 15-second intervals

sshyp-mfa/bin/sshyp-mfa.py

@@ -10,7 +10,7 @@ from sshyp import decrypt, entry_list_gen, shm_gen
 from steam.guard import generate_twofactor_code as steam_totp
 from struct import pack, unpack
 from sys import argv, exit as s_exit
-from time import sleep, time
+from time import sleep, strftime, time
 
 
 def totp(_secret, _algo, _digits, _period):
@@ -59,6 +59,7 @@ if __name__ == '__main__':
               'updated with the newest mfa key')
         while True:
             sleep(1)
+            if str(int(strftime('%S'))/15).endswith('.0'):
                 if mfa_data[0] == 'steam':
                     _mfa_key = steam_totp(b32decode(mfa_data[1]))
                 else: