Merge pull request #4 from hackersandslackers/renovate/certifi-2019.x

Update dependency certifi to v2019.11.28

Author: toddbirchard

requirements.txt

@@ -1,5 +1,5 @@
 cachetools==3.1.1
-certifi==2019.6.16
+certifi==2019.11.28
 chardet==3.0.4
 google-api-core==1.22.1
 google-auth==1.6.3