Warren Harper

MySQL driver can't handle non-alphanumeric passwords

1

## Problem When using non-alphanumeric credentials, migrate fails to connect. [database/mysql/mysql.go#L93](https://github.com/mattes/migrate/blob/da4160ce04a9558d427373b13e3faed47deedc30/database/mysql/mysql.go#L93) calls `migrate.FilterCustomQuery(purl).String()` which in turn calls `url.UserInfo.String()`. `url.UserInfo.String()` ends up escaping the password resulting in an access denied error....