fix: correct syntax errors and undefined variables in README example

README.md

@@ -257,7 +257,7 @@ var editor = EditorJS({
            * @param {File} file - file selected from the device or pasted by drag-n-drop
            * @return {Promise.<{success, file: {url}}>}
            */
-          uploadByFile(file){
+          uploadByFile(file) {
             // your own uploading logic here
             return MyAjax.upload(file).then(() => {
               return {
@@ -275,17 +275,17 @@ var editor = EditorJS({
            * @param {string} url - pasted image URL
            * @return {Promise.<{success, file: {url}}>}
            */
-          uploadByUrl(url){
+          uploadByUrl(url) {
             // your ajax request for uploading
-            return MyAjax.upload(file).then(() => {
+            return MyAjax.upload(url).then(() => {
               return {
                 success: 1,
                 file: {
-                  url: 'https://codex.so/upload/redactor_images/o_e48549d1855c7fc1807308dd14990126.jpg',,
+                  url: 'https://codex.so/upload/redactor_images/o_e48549d1855c7fc1807308dd14990126.jpg',
                   // any other image data you want to store, such as width, height, color, extension, etc
                 }
-              }
-            })
+              };
+            });
           }
         }
       }