Merge branch 'shadow-2'

Merge branch 'shadow-2'

# Conflicts:
#	README.md
#	build.gradle

fix initialization for the gradle plugin DSL

Furthermore this bumps the version to 1.0.1.

As the previous commit message was not linked:
this issues #GradleUp/shadow#207,
fixes TheBoegl/gradle-launch4j#40,
fixes edwgiz/maven-shaded-log4j-transformer#1,
and fixes edwgiz/maven-shaded-log4j-transformer#4.

Signed-off-by: Sebastian Bögl <info@sebastianboegl.de>

This adds a first working implementation for the shadow plugin 1.x

This uses the MAJOR version number from the shadow plugin and expects it to be compliant to semantic versioning.
The dependencies only use the MAJOR version, i.e. log4j 2.+ and shadow 1.+.
This issues #GradleUp/shadow#207,
fixes TheBoegl/gradle-launch4j#40, and
fixes edwgiz/maven-shaded-log4j-transformer#4.