[refactor] changed server.js for heroku deployment test
[refactor] changed server.js for heroku deployment test

SillyKnight/OmniBooks,yoshi415/OmniBooks,Mavmeister/KrakenBooks,szwang/OmniBooks,yoshi415/OmniBooks,yoshioka-s/OmniBooks,SillyKnight/OmniBooks,szwang/OmniBooks,Mavmeister/KrakenBooks,yoshioka-s/OmniBooks