Upgrading maven-shade-plugin to 3.0.0 (#388)

Author: alextu

core/pom.xml

@@ -136,7 +136,7 @@
         <plugins>
             <plugin>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>2.4.3</version>
+                <version>3.0.0</version>
                 <executions>
                     <execution>
                         <phase>package</phase>