Version 2.7.1

Upgraded library dependencies
Updated deploy.yaml to 2.7.1 and node12.x runtime

Fixing bug introduced in a5533e2 wrt MaxRetryMS

Version 2.5.7

* added support for postgres connection keepalives with pg-ka-fix
* added back off on batch ID reload, as customers were observing very
high bursts of reloads without other processes having time to implement
batch rotation

Version 2.5.3

Bug Fix

Version 2.5.1

Support for environment variables to set debug

Merge pull request awslabs#65 from philltomlinson/master

Add createS3TriggerFile.js to the windows build script