Upgrade **requests** version to remove vulnerability (https://nvd.nist.gov/vuln/detail/CVE-2018-18074)

Author: floscha

setup.py

@@ -12,7 +12,7 @@
     license='MIT',
     packages=find_packages(),
     install_requires=[
-        'requests==2.19.1',
+        'requests==2.20.1',
         'retrying==1.3.3',
     ],
     zip_safe=False,