Update cheatsheets

sequelize

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sequelize
+
+> Promise-based Node.js ORM for Postgres, MySQL, MariaDB, SQLite and Microsoft SQL Server.
+> More information: <https://sequelize.org/>.
+
+- Create a model with 3 fields and a migration file:
+
+`sequelize model:generate --name {{table_name}} --attributes {{field1:integer,field2:string,field3:boolean}}`
+
+- Run the migration file:
+
+`sequelize db:migrate`
+
+- Revert all migrations:
+
+`sequelize db:migrate:undo:all`
+
+- Create a seed file with the specified name to populate the database:
+
+`sequelize seed:generate --name {{seed_filename}}`
+
+- Populate database using all seed files:
+
+`sequelize db:seed:all`