Rely on Exception#message rather than overloading with attr_reader #11
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Ruby implements a method, Exception#message, which returns the result of calling #to_s on the exception object: https://ruby-doc.org/core-2.2.0/Exception.html#method-i-message
In the ApiError class, the constructor in some cases sets @message to be an HTTP::Response object. Removing the message attr_reader allows Exception#message to be called instead, which in turn calls #to_s. This change ensures that #message always returns a string, rather than sometimes unexpectedly returning an HTTP::Response object.