Update pom.xml

Fix versioning

Author: filip26

pom.xml

@@ -7,7 +7,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.apicatalog</groupId>
     <artifactId>copper-multibase</artifactId>
-    <version>1.2.0</version>
+    <version>4.0.0</version>
     <packaging>jar</packaging>
 
     <name>Copper Multibase</name>