Added range examples in docs (model definition section)

docs/docs/models-definition.md

@@ -118,6 +118,14 @@ Sequelize.BLOB                        // BLOB (bytea for PostgreSQL)
 Sequelize.BLOB('tiny')                // TINYBLOB (bytea for PostgreSQL. Other options are medium and long)
 
 Sequelize.UUID                        // UUID datatype for PostgreSQL and SQLite, CHAR(36) BINARY for MySQL (use defaultValue: Sequelize.UUIDV1 or Sequelize.UUIDV4 to make sequelize generate the ids automatically)
+
+Sequelize.RANGE(Sequelize.INTEGER)    // Defines int4range range. PostgreSQL only.
+Sequelize.RANGE(Sequelize.BIGINT)     // Defined int8range range. PostgreSQL only.
+Sequelize.RANGE(Sequelize.DATE)       // Defines tstzrange range. PostgreSQL only.
+Sequelize.RANGE(Sequelize.DATEONLY)   // Defines daterange range. PostgreSQL only.
+Sequelize.RANGE(Sequelize.DECIMAL)    // Defines numrange range. PostgreSQL only.
+
+Sequelize.ARRAY(Sequelize.RANGE(Sequelize.DATE)) // Defines array of tstzrange ranges. PostgreSQL only.
 ```
 
 The BLOB data type allows you to insert data both as strings and as buffers. When you do a find or findAll on a model which has a BLOB column. that data will always be returned as a buffer.