build: bump major version

resolves #185

Author: jeremylong

pom.xml

@@ -24,7 +24,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.github.package-url</groupId>
   <artifactId>packageurl-java</artifactId>
-  <version>1.6.0-SNAPSHOT</version>
+  <version>2.0.0-SNAPSHOT</version>
   <packaging>jar</packaging>
 
   <name>Package URL</name>