chore(package): update express to version 4.13.3
chore(package): update express to version 4.13.3

http://greenkeeper.io/
aniket-deole/HK2015,vibhasinghal/personality-insights-nodejs,elridgedmello/watson-personality-insights-nodejs,jcarboneri/simple-tc-pi-blx-demo,jcarboneri/simple-tc-pi-blx-demo,vibhasinghal/personality-insights-nodejs,elridgedmello/watson-personality-insights-nodejs,aprilwebster/personality-insights-nodejs,watson-developer-cloud/personality-insights-nodejs,aprilwebster/personality-insights-nodejs,watson-developer-cloud/personality-insights-nodejs