Update numpy from 1.15.4 to 1.16.0

Author: pyup-bot

requirements.txt

@@ -7,7 +7,7 @@ Click==7.0
 cssselect==1.0.3
 idna==2.8
 lxml==4.3.0
-numpy==1.15.4
+numpy==1.16.0
 pandas==0.23.4
 pyquery==1.4.0
 python-dateutil==2.7.5