Upgrade to Container Customizer 2
Upgrade to Container Customizer 2

This change updates the Container Customizer dependency to 2.+ in order to
support Spring Boot 2.

[resolves #518]

tom-collings/jboss-buildpack,Appdynamics/java-buildpack,hmlingesh/java-buildpack,cloudfoundry-community/jboss-buildpack,svenfrauen/java-buildpack,Appdynamics/java-buildpack,rakutentech/java-buildpack,waltersve/java-buildpack,cloudfoundry-community/tomee-buildpack,cloudfoundry-community/tomee-buildpack,waltersve/java-buildpack,rakutentech/java-buildpack,cloudfoundry-community/jboss-buildpack,hmlingesh/java-buildpack,stipx/java-buildpack,hmlingesh/java-buildpack,PatrikSteuer/java-buildpack,tom-collings/jboss-buildpack,cloudfoundry/java-buildpack,hmlingesh/java-buildpack,stipx/java-buildpack,cloudfoundry/java-buildpack,PatrikSteuer/java-buildpack,svenfrauen/java-buildpack