Fix typo 🐙

src/index.js

@@ -10,7 +10,7 @@ async function readCredentials() {
 
 async function readChromiumOpts() {
   try {
-    const data = await promisify(fs.readFile)('chromium-opts.json', 'uft-8')
+    const data = await promisify(fs.readFile)('chromium-opts.json', 'utf-8')
     return JSON.parse(data)
   } catch (e) {
     return undefined