Eliminate deprecation warning about postgres ssl

backend/config/sequelize.js

@@ -9,9 +9,11 @@ module.exports = {
   },
   production: {
     url: process.env.DATABASE_URL,
-    ssl: true,
     dialectOptions: {
-      ssl: true
+      ssl: {
+        require: true,
+        rejectUnauthorized: false
+      }
     }
   }
 }