chore(package): update mongoose to version 4.2.9
chore(package): update mongoose to version 4.2.9

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