update error message from api

lib/API.js

@@ -36,7 +36,7 @@ class API {
             request.get({ url: url, headers: headers }, (err, response, body) => {
                 let parsedBody = JSON.parse(body)
 
-                if(err || !parsedBody.firstDegreeSize) reject(err);             
+                if(err || !parsedBody.firstDegreeSize) reject(err ? err : parsedBody.message);             
                 resolve(JSON.parse(body));
             });
         });