more lint

.eslintrc

@@ -11,6 +11,9 @@
     "no-else-return": 0,
     "new-cap": 0,
     "no-param-reassign": 0,
+    no-unused-vars: ["error", {
+      "argsIgnorePattern": "^_",
+    }],
   },
   "settings" : {
     "import/resolver": {

frontend/components/MarkdownEditor/MarkdownEditor.js

@@ -77,14 +77,14 @@ class MarkdownEditor extends React.Component {
         method: 'post',
         body: formData,
       })
-      .then(s3Response => {
+      .then(_s3Response => {
         this.props.replaceText({
           original: pendingUploadTag,
           new: `![${file.name}](${data.asset.url})`,
         });
         editor.setCursor(newCursorPositionLine, 0);
       })
-      .catch(err => {
+      .catch(_err => {
         this.props.replaceText({
           original: pendingUploadTag,
           new: '',