Update Shadow's link

https://github.com/GradleUp/shadow

README.md

@@ -95,7 +95,7 @@ provides a report of the dependencies used/unused and provides a debloated versi
 |---|---|
 | [maven-shade-plugin](https://maven.apache.org/plugins/maven-shade-plugin/) | allows to inline and optimize dependencies into a single jar |
 | [gradle-lean](https://github.com/cuzfrog/gradle-lean) | gradle version of the maven-shade plugin (stale) |
-| [shadow](https://github.com/johnrengelman/shadow) | gradle version of the maven-shade plugin |
+| [shadow](https://github.com/GradleUp/shadow) | gradle version of the maven-shade plugin |
 | [jarjar](http://code.google.com/p/jarjar/) | allows to inline and optimize dependencies into a single jar (stale) |
 | [proguard](https://github.com/Guardsquare/proguard) | obfuscator, shrinker (GPL) |
 | [DepClean](https://github.com/castor-software/depclean) |  provides a report of the dependencies used/unused and provides a debloated version of the pom.xml|