Try to fix travis

beem/vote.py

@@ -31,7 +31,9 @@ class Vote(BlockchainObject):
         .. code-block:: python
 
            >>> from beem.vote import Vote
-           >>> v = Vote("@gtg/steem-pressure-4-need-for-speed|gandalf")
+           >>> from beem import Steem
+           >>> stm = Steem("https://steemd.minnowsupportproject.org")
+           >>> v = Vote("@gtg/steem-pressure-4-need-for-speed|gandalf", steem_instance=stm)
 
     """
     type_id = 11

requirements-test.txt

@@ -23,6 +23,7 @@ pytest
 pytest-mock
 pytest-cov
 coverage
+mock
 parameterized
 tox
 codacy-coverage

tox.ini

@@ -21,10 +21,7 @@ deps =
     secp256k1
     scrypt
 commands =
-    coverage run --parallel-mode -m pytest tests/beemapi tests/beembase tests/beemgraphene {posargs}
-    coverage combine
-    coverage report -m
-    coverage xml
+    pytest tests/beemapi tests/beembase tests/beemgraphene {posargs}
 
 [testenv:py36]
 deps =