Update README.md

Author: jackycute

README.md

@@ -49,11 +49,12 @@ If you are upgrading HackMD from an older version, follow below steps:
 
 1. Fully stop your old server first (important).
 2. `git pull` or whatever that really update the files.
-3. Modify the file named `.sequelizerc`, change the value of the variable `url` with your db connection string.  
+3. `npm install && bower install` to update dependencies.
+4. Modify the file named `.sequelizerc`, change the value of the variable `url` with your db connection string.  
    For example: `postgres://username:password@localhost:5432/hackmd`.
-4. Run `node_modules/.bin/sequelize db:migrate`, this step will migrate your db with the latest schema.  
+5. Run `node_modules/.bin/sequelize db:migrate`, this step will migrate your db with the latest schema.  
    You can also revert the migration with `node_modules/.bin/sequelize db:migrate:undo` (do this with caution).
-5. Start your whole new server!
+6. Start your whole new server!
 
 Structure
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