Update help for --start-live-server option

Author: vitalk

pytest_flask/plugin.py

@@ -118,7 +118,7 @@ def pytest_addoption(parser):
     group.addoption('--start-live-server',
                     action="store_true", dest="start_live_server", default=True,
                     help="start server automatically when live_server "
-                         "fixture is applyed.")
+                         "fixture is applyed (enabled by default).")
     group.addoption('--no-start-live-server',
                     action="store_false", dest="start_live_server",
                     help="don't start server automatically when live_server "