fix linter errors

jwt/api_jws.py

@@ -1,7 +1,6 @@
 import binascii
 import json
 import warnings
-
 from collections import Mapping
 
 from .algorithms import (

jwt/api_jwt.py

@@ -1,6 +1,5 @@
 import json
 import warnings
-
 from calendar import timegm
 from collections import Mapping
 from datetime import datetime, timedelta

jwt/contrib/algorithms/pycrypto.py

@@ -1,7 +1,6 @@
 import Crypto.Hash.SHA256
 import Crypto.Hash.SHA384
 import Crypto.Hash.SHA512
-
 from Crypto.PublicKey import RSA
 from Crypto.Signature import PKCS1_v1_5
 

tests/test_api_jws.py

@@ -1,6 +1,5 @@
 
 import json
-
 from decimal import Decimal
 
 from jwt.algorithms import Algorithm

tests/test_api_jwt.py

@@ -1,7 +1,6 @@
 
 import json
 import time
-
 from calendar import timegm
 from datetime import datetime, timedelta
 from decimal import Decimal

tests/utils.py

@@ -1,6 +1,5 @@
 import os
 import struct
-
 from calendar import timegm
 from datetime import datetime