code: public boolean isUpdateForVersionCode() {
  		Set<Integer> uniques = new HashSet<Integer>();
  		for (VersionHistoryItem item : versionHistoryItems) {
  			uniques.add(item.getVersionCode());
  		}
  		return uniques.size() > 1;
  	}
docs: Returns true if the current versionCode is not the first version or build that we have seen. Basically, it just
  looks for two or more versionCodes.
  
  @return True if this is not the first versionCode of the app we've seen.