log4j errors when installed as bootstrap's sh

## steps

Giter8 version: `giter8-bootstrap_2.12-0.13.1.sh` from https://repo1.maven.org/maven2/org/foundweekends/giter8/giter8-bootstrap_2.12/0.13.1/

## problem

An attempt to use it produces unexpected ERROR logs:
```
√ vault % g8 UdashFramework/udash.g8
log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a "org.apache.log4j.Appender" variable.
log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
log4j:ERROR [java.net.URLClassLoader@25641d39] whereas object of type
log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by [java.net.URLClassLoader@5b480cf9].
log4j:ERROR Could not instantiate appender named "stderr".
name [My Udash Application]:
```

## expectation

Should work without ERROR