Avoid numpy==1.16.0 --> results in error 'cannot set WRITABLE flag'

solution seems to be to downgrade from numpy 1.16:
pandas-dev/pandas#24839

Author: alpae

requirements.txt

@@ -1,7 +1,7 @@
 future>=0.14.3
-numpy>=1.9.2
+numpy>=1.13,<1.16.0
 numexpr>=2.4
-tables>=3.2.2
+tables>=3.4
 cython
 PySAIS
 biopython

setup.py

@@ -5,8 +5,8 @@
 
 name = 'pyoma'
 
-req_packages = ['numpy', 'tables>=3.2', 'future', 'fuzzyset',
-                'tqdm', 'pyopa', 'pandas>=0.21', 'biopython']
+req_packages = ['numpy>=1.13,<1.16', 'tables>=3.4', 'future', 'fuzzyset>=0.0.17',
+                'tqdm', 'pyopa>=0.8', 'pandas>=0.21', 'biopython']
 if sys.version_info < (3, 3):
     req_packages.extend(['mock', 'functools32'])