Add link to discord server. (#1473)

* Add link to discord server.

* Suppress too slow healthcheck.

* Fix ordering of imports.

Author: drvinceknight

README.rst

@@ -7,6 +7,9 @@
 .. image:: https://github.com/Axelrod-Python/Axelrod/workflows/CI/badge.svg
     :target: https://github.com/Axelrod-Python/Axelrod/actions
 
+Join `the Game Theory Discord <https://github.com/drvinceknight/equilibrium_explorers>`_
+server to chat -- `direct invite link <https://discord.gg/NfTAkhAeyc>`_.
+
 Axelrod
 =======
 

axelrod/tests/unit/test_strategy_utils.py

@@ -2,7 +2,7 @@
 
 import unittest
 
-from hypothesis import given, settings
+from hypothesis import HealthCheck, given, settings
 from hypothesis.strategies import integers, lists, sampled_from
 
 import axelrod as axl
@@ -20,7 +20,7 @@ class TestDetectCycle(unittest.TestCase):
         cycle=lists(sampled_from([C, D]), min_size=2, max_size=10),
         period=integers(min_value=3, max_value=10),
     )
-    @settings(max_examples=5)
+    @settings(max_examples=5, suppress_health_check=(HealthCheck.too_slow,))
     def test_finds_cycle(self, cycle, period):
         history = cycle * period
         detected = detect_cycle(history)