make artifactId lowercase for github packages compatibility (#3)

Author: windndust

src/main/resources/archetype-resources/pom.xml

@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 
 	<groupId>${groupId}</groupId>
-	<artifactId>${artifactId}</artifactId>
+	<artifactId>${artifactId.toLowerCase()}</artifactId>
 	<version>${version}</version>
 	<packaging>jar</packaging>