Cannot migrate stored procedure

## I'm submitting a...

- [x] Bug report
- [ ] Feature request
- [ ] Question

## Current behavior
When created a stored procedure it's necessary to change the delimiter
e.g. DELIMITER $$

However, when using a SQL-file it returns ER_PARSE_ERROR:

## Expected behavior
Be able to change the delimiter, create the SP and return delimiter back to standard ;

## Minimal reproduction of the problem with instructions

DELIMITER //
CREATE PROCEDURE testProc()
BEGIN
SELECT 1;
END //
DELIMITER ;

## What is the motivation / use case for changing the behavior?
Cannot create or migrate stored procedures

## Environment

db-migrate version: 0.11.5

db-migrate-mysql with versions: 1.1.10


Additional information:

- Node version: 8.12.0  

- Platform:  Mac

Others:

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