Vulnerability warning for logback

Running the [OWASP dependency check](https://owasp.org/www-project-dependency-check/) on version 1.0.0 gives a vulnerability warning

`jlib-awslambda-logback-1.0.0.jar (pkg:maven/org.jlib/jlib-awslambda-logback@1.0.0, cpe:2.3:a:logback:logback:1.0.0:*:*:*:*:*:*:*) : CVE-2017-5929
`

which corresponds to this issue [CVE-2017-5929](https://nvd.nist.gov/vuln/detail/CVE-2017-5929#range-3595106)