Update banner.jade
Update banner.jade

fix api reference link
agilemobiledev/tone-analyzer-nodejs,M4gn4tor/tone-analyzer-nodejs,sammcj/tone-analyzer-nodejs,JackieJ/tone-analyzer-nodejs,herchu/tone-analyzer-nodejs,tankcdr/tone-analyzer-nodejs,agilemobiledev/tone-analyzer-nodejs,chrismoulton/tone-analyzer-nodejs,danielchalef/tone-analyzer-nodejs,watson-developer-cloud/tone-analyzer-nodejs,watson-developer-cloud/tone-analyzer-nodejs,ndruger/tone-analyzer-nodejs,M4gn4tor/tone-analyzer-nodejs,JackieJ/tone-analyzer-nodejs,danielchalef/tone-analyzer-nodejs,sammcj/tone-analyzer-nodejs,ndruger/tone-analyzer-nodejs,chrismoulton/tone-analyzer-nodejs,tankcdr/tone-analyzer-nodejs,herchu/tone-analyzer-nodejs