don't use eslint on JSON notes, closes #70

src/public/libraries/codemirror/addon/lint/eslint.js

@@ -28,6 +28,11 @@
     }
 
     async function validatorJavaScript(text, options) {
+        if (noteEditor.getCurrentNote().detail.mime === 'application/json') {
+            // eslint doesn't seem to validate pure JSON well
+            return [];
+        }
+
         await requireLibrary(ESLINT);
 
         if (text.length > 20000) {