Merge pull request #6307 from docker/bump_requests

Bump requests version in requirements.txt

requirements.txt

@@ -16,7 +16,7 @@ pypiwin32==219; sys_platform == 'win32' and python_version < '3.6'
 pypiwin32==223; sys_platform == 'win32' and python_version >= '3.6'
 PySocks==1.6.7
 PyYAML==3.12
-requests==2.19.1
+requests==2.20.0
 six==1.10.0
 texttable==0.9.1
 urllib3==1.21.1; python_version == '3.3'