How to alter a table using an SQL schema?

Question

I'm using sqlx to connect my MySQL database to Golang. I've got an SQL schema where all the CREATE TABLE IF NOT EXISTS... statements are defined. Here an example:

CREATE TABLE IF NOT EXISTS `users`
  (
     `id` INT(0) NOT NULL auto_increment,
     `language_code` VARCHAR(5) NOT NULL,
     `premium` BIT(0) DEFAULT 0,
     `status` VARCHAR(100) NOT NULL DEFAULT '',
     `user_id` INT(0) NOT NULL,
     PRIMARY KEY (id)
  );
...

Here how I connect to database and I execute all the queries everytime:

Database, err = sqlx.Connect(Config.Database.Type, Config.Database.DataSourceString) // Connect to the database

if err != nil { // If there's an error, handle it
    panic(err.Error())
}

defer Database.Close() // Close the database when the function finishes

schemaSQL, err := ioutil.ReadFile("schema.sql") // Read the configuration file (DealsFinderBot/config.yaml)

if err != nil { // If there's an error, handle it
    panic(err.Error())
}

for _, query := range strings.Split(string(schemaSQL), ";") { // Loop on the queries of the schema
    if strings.TrimSpace(query) != "" { // If the query is not empty
        Database.MustExec(query) // Execute the query
    }
}

I would like to update every time (alter a table) everytime I add a new column or I edit some parameters (like NOT NULL or DEFAULT ''). How could I do this?