set log level doesn't work for standalone mode

[Gordiievskyi]

Describe the bug
Log level isn't set by yaml as documentation states git docs.

First want to say thanks for doing this great project.
Guys I realy need it to debug, I have a very strange errors when part of content is missing but info level do not show anything

To Reproduce
Steps to reproduce the behavior:

1. Download proxy zip
2. Unpack zip and navigate inside the folder
3. Navigate to bin folder.
4. Create conf folder
5. Create bup-logging.yaml with content:

Configutation:
    name: Default
    Appenders:
      Console:
        name: Console_Appender
        target: SYSTEM_OUT
    Loggers:
      Root:
        level: warn
        AppenderRef:
          - ref: Console_Appender
      Logger:
        - name: com.browserup.bup
          level: warn
          AppenderRef:
            - ref: Console_Appender

6. Start you proxy ./browserup-proxy-2.0.1/bin/browserup-proxy

Actual result:
[INFO 2020-08-28T14:57:26,184 com.browserup.bup.proxy.Main] - default info level still applied.

Expected behavior
no message appears and log level is warn

Screenshots
If applicable, add screenshots to help explain your problem.

Please complete the following information:

• OS: MAC OS 10.14.6
• not applied
• Version browserup-proxy-2.0.1

Additional context
Java 1.8.0_231-b11