fix error handling

Author: German Lena

index.js

@@ -32,6 +32,7 @@ async function run(params) {
     await output.build(params);
   } catch (e) {
     logger.error(e);
+    return e;
   }
 }
 

lib/image_handler.js

@@ -17,7 +17,7 @@ function prepare(image, {pxWidth, pxHeight, imageBrighness, imageContrast, image
   }
 
   if (imageContrast) {
-    image.imageContrast(imageContrast);
+    image.contrast(imageContrast);
   }
 
   return image;