Update app.js
Update app.js

service now handle special characters.
dou800/text-to-speech-nodejs,skaegi/text-to-speech-nodejs-with-saucelabs,hmagph/text-to-speech-nodejs-with-test,sktay/text-to-speech-nodejs,hmagph/otcnov10demo,hmagph/text-to-speech-nodejs-with-saucelabs,watson-developer-cloud/text-to-speech-nodejs,colinsf/text-to-speech-nodejs,dou800/text-to-speech-nodejs,skaegi/text-to-speech-nodejs-with-saucelabs,hmagph/text-to-speech-nodejs-with-test,colinsf/text-to-speech-nodejs,hmagph/otcnov10demo,sktay/text-to-speech-nodejs,hmagph/text-to-speech-nodejs-with-saucelabs