Bump dependency versions

[simonw]

No description provided.

[simonw]

The problem is Sanic. Here's the error I'm getting:

(venv) datasette $ pytest -x 
============================================================= test session starts ==============================================================
platform darwin -- Python 3.7.1, pytest-4.0.0, py-1.7.0, pluggy-0.8.0
rootdir: /Users/simonw/Dropbox/Development/datasette, inifile:
collected 258 items                                                                                                                            

tests/test_api.py ...................F

=================================================================== FAILURES ===================================================================
_______________________________________________________ test_table_with_slashes_in_name ________________________________________________________

app_client = <tests.fixtures.TestClient object at 0x10ada7d68>

    def test_table_with_slashes_in_name(app_client):
        response = app_client.get('/fixtures/table%2Fwith%2Fslashes.csv?_shape=objects&_format=json')
>       assert response.status == 200
E       AssertionError: assert 404 == 200

That's because something about how Sanic handles escape characters in URLs changed between 0.7.0 and 0.8.3.

[simonw]

This is very obsolete now.