Upgrade to maven-shade-plugin 3.2.1

Closes gh-242

Author: philwebb

pom.xml

@@ -148,7 +148,7 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-shade-plugin</artifactId>
-					<version>3.2.1</version>
+					<version>3.2.4</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>