Bump awscli from 1.15.10 to 1.15.19

Bumps [awscli](http://aws.amazon.com/cli/) from 1.15.10 to 1.15.19.

Signed-off-by: dependabot[bot] <support@dependabot.com>

requirements.txt

@@ -12,7 +12,7 @@ python-simple-hipchat==0.2
 prettytable==0.7.2
 # Don't forget to update the version of this installed in
 # the aws role as well.
-awscli==1.15.10
+awscli==1.15.19
 requests==2.18.4
 datadog==0.8.0
 networkx==1.11

requirements3.txt

 # Needed for SES limits check job
 boto3==1.7.14
-awscli==1.15.10
+awscli==1.15.19