Maven gives duplicate dependency warning

[tayler-jones]

the exact same guava dependency is declared twice in aws-glue-datacatalog-client-common/pom.xml, resulting in the following maven warnings:
[WARNING] Some problems were encountered while building the effective model for com.amazonaws.glue:aws-glue-datacatalog-client-common:jar:1.10.0-SNAPSHOT [WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: com.google.guava:guava:jar -> duplicate declaration of version ${guava.version} @ com.amazonaws.glue:aws-glue-datacatalog-client-common:[unknown-version], /tmp/glue/aws-glue-datacatalog-client-common/pom.xml, line 72, column 21 [WARNING] [WARNING] It is highly recommended to fix these problems because they threaten the stability of your build. [WARNING] [WARNING] For this reason, future Maven versions might no longer support building such malformed projects.

[tayler-jones]

See PR to fix: #31