Potentially unnecessary tripple error.

[picatz]

Could probably cleanup the error when a client is initialized without an API key.

[1] pry(main)> require "shodanz"
=> true
[2] pry(main)> client = Shodanz.client.new
No key has been found or provided!
No key has been found or provided!
No key has been found or provided!

This is happening because the client class is simply a proxy to the three other API classes; and so the key is stored once for each API. This allows for multiple API keys to be used by the same client / or for API keys to be changed later.

Maybe this feature could be removed to make things simpler. Or, at least the error could be caught once when the client is initialized.

This needs to be cleaned up further.