Medoo Schema Option

[WeslleyRAraujo]

I found myself in a situation where I needed to use another schema, so i made this change to the tableQuote method and added $this->schema attribute for globally schema

a example of my use:

// in Medoo constructor i pass ['schema' => 'information_schema']
$medoo->select('columns', ['data_type'], ['table_name' => "{$this->table}"]);

// also you can use like this
// in Medoo constructor don't pass ['schema' => 'information_schema']
$medoo->select('information_schema.columns', ['data_type'], ['table_name' => "{$this->table}"]);

raw query (Postgresql)

SELECT "data_type" FROM information_schema."columns"
WHERE  "table_name" = $tableName;