Merge pull request #43 from Axelrod-Python/requirements

Remove requirements.in and simplify requirements.txt

Author: marcharper

requirements.in

@@ -1,19 +1 @@
-#
-# This file is autogenerated by pip-compile
-# To update, run:
-#
-#    pip-compile --output-file requirements.txt requirements.in
-#
-axelrod==3.1.2
-cycler==0.10.0            # via matplotlib
-hypothesis==3.14.0        # via axelrod
-matplotlib==2.0.2         # via axelrod
-numpy==1.13.1             # via axelrod, matplotlib, scipy
-prompt-toolkit==1.0.14    # via axelrod
-pyparsing==2.2.0          # via matplotlib
-python-dateutil==2.6.1    # via matplotlib
-pytz==2017.2              # via matplotlib
-scipy==0.19.1             # via axelrod
-six==1.10.0               # via cycler, matplotlib, prompt-toolkit, python-dateutil
-tqdm==4.15.0              # via axelrod
-wcwidth==0.1.7            # via prompt-toolkit
+axelrod=>3.1.2