Update the README to use new tournament option.

I have also bumped the minimum requirement for Axelrod as this is the
one actually needed to reproduce Axelrod's second tournament.

Closes #41

Author: drvinceknight

.gitignore

@@ -67,3 +67,7 @@ docs/_build
 
 *.sublime-project
 *.sublime-workspace
+
+# Test outputs
+second_tournament*.svg
+summary.csv

README.rst

@@ -39,7 +39,8 @@ Running an instance of Axelrod's second tournament:
    >>> players = [axlf.Player(name) for name in axlf.second_tournament_strategies]
    >>> print(len(players), "players")
    63 players
-   >>> tournament = axl.Tournament(players, repetitions=1, turns=200)
+   >>> tournament = axl.Tournament(players, repetitions=1,
+   ...                             turns=63, match_attributes={"length": -1})
    >>> results = tournament.play()
    >>> results.write_summary('summary.csv')
    >>> plot = axl.Plot(results)

requirements.txt

@@ -1 +1 @@
-axelrod>=3.1.2
+axelrod>=3.3.0

setup.py

@@ -54,7 +54,7 @@ def read(*names, **kwargs):
         'Topic :: Utilities',
     ],
     install_requires=[
-        'axelrod >= 3.2.1',
+        'axelrod >= 3.3.0',
     ],
     python_requires=">=3.5",
 )