MySQL expects integer, not string

[iwankgb]

While running make I got following error:

~/go_workspace/src/github.com/mattes/migrate • make                                                                                                         11:46  iwan@iwan-developmen
docker-compose run --rm go-test
ERROR: The Compose file './docker-compose.yml' is invalid because:
mysql.environment.MYSQL_ALLOW_EMPTY_PASSWORD contains true, which is an invalid type, it should be a string, number, or a null
Makefile:11: recipe for target 'test' failed
make: *** [test] Error 1

OS: Ubuntu 16.04
Go: 1.6
Docker 1.11.1
docker-compose: 1.7.1

[gravis]

The doc doesn't mention that: https://hub.docker.com/_/mysql/

MYSQL_ALLOW_EMPTY_PASSWORD
This is an optional variable. Set to yes to allow the container to be started with a blank password for the root user.

It should be changed to "yes" instead. fixed by gemnasium/migrate#2