Try to pin specific numpy release. Issue #10

Author: dpellow

setup.py

@@ -22,7 +22,7 @@
         'networkx==2.4',
         'pysam==0.15.3',
         'nose==1.3',
-        'numpy==1.17'],
+        'numpy==1.17.4'],
     package_data = {'scapp':['data/*/*']},
     include_package_data=True,
     entry_points = {