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Updated the hex dep version.
As well I updated the topic send example since for sending a message to a topics it's required the following format
/topics/$topic
As a suggestion, I would consider validating the correct format and five user info about this error, since the one from Google it's not clear enough (returns an error
%{"error" => "InvalidRegistration"}
). Or even I would consider prepending the/topics/
string to the given one if does not match the required format.