chore: upgrade sequelize (#965)

* 0.18.0

* chore: Upgrade sequelize 4 -> 5

* fix: migrations v5 support

* fix: Majority of test failures

* fix: the rest of v5 tests

server/utils/jwt.js

@@ -13,7 +13,7 @@ export async function getUserForJWT(token: string) {
 
   if (!payload) throw new AuthenticationError('Invalid token');
 
-  const user = await User.findById(payload.id);
+  const user = await User.findByPk(payload.id);
 
   try {
     JWT.verify(token, user.jwtSecret);