Enable no-case-declarations lint

src/character-card-parser.js

@@ -7,7 +7,7 @@ const parse = async (cardUrl, format) => {
     let fileFormat = format === undefined ? 'png' : format;
 
     switch (fileFormat) {
-        case 'png':
+        case 'png': {
             const buffer = fs.readFileSync(cardUrl);
             const chunks = extract(buffer);
 
@@ -23,6 +23,7 @@ const parse = async (cardUrl, format) => {
             }
 
             return Buffer.from(textChunks[0].text, 'base64').toString('utf8');
+        }
         default:
             break;
     }