Bump certifi from 2019.3.9 to 2019.6.16

dependabot-preview[bot] · dependabot-preview[bot] · commit 53dceaaa5841 · 2019-06-17T18:54:37.000Z
Bumps [certifi](https://github.com/certifi/python-certifi) from 2019.3.9 to 2019.6.16. - [Release notes](https://github.com/certifi/python-certifi/releases) - [Commits](certifi/python-certifi@2019.03.09...2019.06.16) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
diff --git a/requirements.txt b/requirements.txt
@@ -1,4 +1,4 @@
-certifi==2019.3.9
+certifi==2019.6.16
 chardet==3.0.4
 idna==2.8
 requests==2.22.0

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-certifi==2019.3.9`
	`1`	`+certifi==2019.6.16`
`2`	`2`	`chardet==3.0.4`
`3`	`3`	`idna==2.8`
`4`	`4`	`requests==2.22.0`