Ensure that serialized signatures use HashSets #24
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Because Animal Sniffer signatures are serialized using Java Serialization, we need to make sure that the types embedded into the signatures are available on the classpath when Animal Sniffer is run. Specifically, for Clazz.signatures, when the set is empty, Kotlin's toSet method will return a kotlin.collections.EmptySet. This change ensures that a plain HashSet is always used.
Fixes #23.