add black formatting

.travis.yml

@@ -1,4 +1,4 @@
 language: python
 python: 3.6
 install: pip install .
-script: pytest
+script: black . && pytest

conf.py

@@ -1,12 +1,10 @@
 import sys
 import os
 
-sys.path.insert(0, os.path.abspath('.'))
+sys.path.insert(0, os.path.abspath("."))
 
 import rail
 
-master_doc = 'README'
+master_doc = "README"
 
-extensions = [
-    'sphinx.ext.autodoc',
-]
+extensions = ["sphinx.ext.autodoc"]

setup.py

@@ -2,13 +2,15 @@
 
 from setuptools import setup
 
-setup(name='RAIL',
-      version='0.5',
-      description='Risk Assessment Library',
-      author='David Bailey',
-      author_email='david@davidabailey.com',
-      url='https://github.com/davidbailey/rail',
-      packages=['rail'],
-      license='MIT License',
-      install_requires=['numpy', 'pandas', 'matplotlib', 'scipy']
+setup(
+    name="RAIL",
+    version="0.6",
+    description="Risk Assessment Library",
+    author="David Bailey",
+    author_email="david@davidabailey.com",
+    url="https://github.com/davidbailey/rail",
+    packages=["rail"],
+    license="MIT License",
+    install_requires=["numpy", "pandas", "matplotlib", "scipy"],
+    tests_requires=["black"],
 )