Log level using an environment variable ignored

[jntakpe]

The documentation mentions it is possible to set property using environment variables.

Nevertheless, LOGGER_LEVELS nor LOG_LEVEL prefixes works maybe I'm missing something but the issue seems to come from the PropertiesLoggingLevelsConfigurer line 81 class where the iteration is performed environment using the StringConvention#RAW so environment variables delimited by underscores are excluded.

To reproduce you can checkout the this project and try changing the logger <logger name="com.github.jntakpe" level="DEBUG"/> to INFO or whatever using an environment variable