chore(requirements): update ruamel.yaml to 0.11.14

https://bitbucket.org/ruamel/yaml/src see changelog at the bottom

Author: helgi

rootfs/requirements.txt

@@ -12,7 +12,7 @@ ndg-httpsclient==0.4.1
 psycopg2==2.6.2
 pyOpenSSL==16.0.0
 pytz==2016.4
-ruamel.yaml==0.11.11
+ruamel.yaml==0.11.14
 requests==2.10.0
 requests-toolbelt==0.6.2
 simpleflock==0.0.3