Update logs (#364)

Author: s0ph1e

lib/scraper.js

@@ -190,7 +190,7 @@ class Scraper {
 				self.loadResource(resource); // Add resource to list for future downloading, see Scraper.waitForLoad
 				return resource;
 			}).catch(function handleError (err) {
-				logger.warn('failed to request resource ' + resource);
+				logger.error('failed to request resource ' + resource);
 				return self.handleError(err, resource);
 			});