Update Brakeman
Update Brakeman

Was reporting invalid status for loofah gem on previous release
as it considered 2.10.0 lower than 2.2.1

```
Message: loofah gem 2.10.0 is vulnerable (CVE-2018-8048). Upgrade to 2.2.1
```

ausaccessfed/saml-service,ausaccessfed/saml-service,ausaccessfed/saml-service,ausaccessfed/saml-service