Add a separate requirements file

Fixes the docs build

Author: michaelosthege

requirements.txt

@@ -0,0 +1,7 @@
+csaps>=0.11
+fastprogress
+joblib
+numpy
+pandas
+scipy
+tsfresh

setup.py

@@ -1,6 +1,9 @@
+import pathlib
 import setuptools
 
 __packagename__ = 'bletl'
+ROOT = pathlib.Path(__file__).parent
+
 
 def get_version():
     import os, re
@@ -33,14 +36,6 @@ def get_version():
             'Intended Audience :: Science/Research',
             'License :: OSI Approved :: GNU Affero General Public License v3',
         ],
-        install_requires=[
-            'csaps>=0.11',
-            'fastprogress',
-            'joblib',
-            'numpy',
-            'pandas',
-            'scipy',
-            'tsfresh',
-        ],
+        install_requires=open(pathlib.Path(ROOT, 'requirements.txt')).readlines(),
     )