Update numpy from 1.16.0 to 1.16.4

Author: pyup-bot

requirements.txt

@@ -7,7 +7,7 @@ Click==7.0
 cssselect==1.0.3
 idna==2.8
 lxml==4.3.3
-numpy==1.16.0
+numpy==1.16.4
 pandas==0.24.2
 pyquery==1.4.0
 python-dateutil==2.7.5