removed the calculation error in mpesa_access_token() (#5)

the mpesa_access_token() had a bug in my system where the OAuth token would not refresh unless the request was sent 51 minutes after it expired. Now if no one used the system for  an hour ,the token minutes would count to 59 then go back to zero since the minutes code would calculate the minutes above the hour  making the old token "valid" since the minutes would be less than 50. I removed the modulus calculation so the minutes always go above 60.

Author: bedah-kym

django_daraja/mpesa/utils.py

@@ -156,7 +156,7 @@ def mpesa_access_token():
 		access_token = generate_access_token()
 	else:
 		delta = timezone.now() - access_token.created_at
-		minutes = (delta.total_seconds()//60)%60
+		minutes = (delta.total_seconds()//60)
 		print('minutes: ', minutes)
 		if minutes > 50:
 			# Access token expired
@@ -202,4 +202,4 @@ def encrypt_rsa(certificate_path, input):
 		encrypted = cert.public_key().encrypt(message, PKCS1v15())
 		output = base64.b64encode(encrypted).decode('ascii')
 
-	return output
+	return output