Merge pull request #3 from digitake/snyk-fix-f4c8283662f58f977ba9b2ae7902b596

Author: digitake

requirements.txt

@@ -4,4 +4,5 @@ oauth2client==3.0.0
 requests-toolbelt==0.7.0
 python-jwt==2.0.1
 pycrypto==2.6.1
-rsa>=4.7 # not directly required, pinned by Snyk to avoid a vulnerability
+rsa>=4.7 # not directly required, pinned by Snyk to avoid a vulnerability
+urllib3>=1.25.9 # not directly required, pinned by Snyk to avoid a vulnerability