Don't look in sub-directories of META-INF/services for service files
Don't look in sub-directories of META-INF/services for service files

A service file cannot be in a subdirectory (they're named by the
class of the service being provided) and some projects (like activemq)
throw random stuff in subdirectories, which shouldn't be merged.

fabiocognigni/sbt-assembly,sbt/sbt-assembly,sbt/sbt-assembly,onilton/sbt-assembly,nkhuyu/sbt-assembly