update dropwizard-example README.md to current version
update dropwizard-example README.md to current version

silly little text files don't keep up with the project
change 0.3.0 to 0.7.0

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,tburch/dropwizard,phouse512/dropwizard,csae1152/dropwizard,chaminda204/dropwizard,taltmann/dropwizard,pkwarren/dropwizard,rgupta-okta/dropwizard,mnrasul/dropwizard,Alexey1Gavrilov/dropwizard,evnm/dropwizard,dropwizard/dropwizard,mulloymorrow/dropwizard,wilko55/dropwizard,MikaelAmborn/dropwizard,wilko55/dropwizard,zhiqinghuang/dropwizard