Change name of error object.

cl-sendgrid.lisp

@@ -1,7 +1,7 @@
 (in-package :cl-sendgrid)
 
 (define-condition sendgrid-error (error)
-  ((message :initarg :message :reader message)))
+  ((sendgrid-error-message :initarg :sendgrid-error-message :reader sendgrid-error-message)))
 
 (defun send-email (&key api-user api-key subject to text html from)
   (let ((r (parse (flexi-streams:octets-to-string
@@ -17,4 +17,5 @@
                   :object-as :alist)))
     (if (string-equal (cdr (assoc "message" r :test #'string-equal)) "success")
         t
-        (error 'sendgrid-error :message (cdr (assoc "errors" r :test #'string-equal))))))
+        (error 'sendgrid-error :sendgrid-error-message
+               (cdr (assoc "errors" r :test #'string-equal))))))