chore(package): update mongoose to version 4.2.3
chore(package): update mongoose to version 4.2.3

http://greenkeeper.io/
HarryAKA/twitter-watson-insights,JakePeyser/runkeeper-hashmatch,l4chong/newbullrush,watson-developer-cloud/your-celebrity-match,JakePeyser/runkeeper-hashmatch,HarryAKA/twitter-watson-insights,watson-developer-cloud/yourcelebritymatch,l4chong/newbullrush,watson-developer-cloud/yourcelebritymatch,watson-developer-cloud/your-celebrity-match