Update requirements

requirements.txt

+atomicwrites==1.3.0
 attrs==17.4.0
 certifi==2018.1.18
 chardet==3.0.4
-click==6.7
+Click==7.0
 idna==2.6
-pluggy==0.6.0
+more-itertools==6.0.0
+pluggy==0.9.0
 py==1.5.2
-pydash==4.3.3
-pytest==3.4.2
-requests==2.20.1
+pydash==4.7.4
+pytest==4.3.0
+requests==2.21.0
 six==1.11.0
 urllib3==1.22