Use correct content-type header, refs #272

tests/test_html.py

@@ -17,6 +17,7 @@ import urllib.parse
 def test_homepage(app_client_two_attached_databases):
     response = app_client_two_attached_databases.get("/")
     assert response.status == 200
+    assert "text/html; charset=utf-8" == response.headers["content-type"]
     soup = Soup(response.body, "html.parser")
     assert "Datasette Fixtures" == soup.find("h1").text
     assert (