added xo maccro

lib/speech-enhancement.js

@@ -44,4 +44,4 @@ const enhancement = (wavFile, speechEnhancement) => {
 
 module.exports = {
   enhancement
-};
\ No newline at end of file
+};

package.json

@@ -7,7 +7,8 @@
     "start": "node app.js",
     "test": "xo && jest",
     "test:watch": "jest --watch",
-    "ci": "yarn && xo && jest --runInBand"
+    "ci": "yarn && xo && jest --runInBand",
+    "xo:fix": "xo --fix"
   },
   "dependencies": {
     "body-parser": "^1.18.2",