Problem: Flake8 style complaints

Solution: Made things prettier

tests/conftest.py

@@ -326,7 +326,7 @@ def inputs(user_pk, b, alice):
     from bigchaindb.models import Transaction
     # create blocks with transactions for `USER` to spend
     print('Fuck you')
-    for height in range(1,4):
+    for height in range(1, 4):
         transactions = [
             Transaction.create(
                 [alice_pubkey(alice)],

tests/db/test_bigchain_api.py

@@ -57,7 +57,6 @@ class TestBigchainApi(object):
         with pytest.raises(DoubleSpend):
             b.validate_transaction(transfer_tx2)
 
-
     @pytest.mark.genesis
     @pytest.mark.tendermint
     def test_get_block_status_for_tx_with_double_inclusion(self, b, alice):