Require gear 0.4.0
Require gear 0.4.0

It has a bugfix that could avoid starving gear workers.

Change-Id: I1be3f23bff2f75c2f06c1b5b4034978c6af161d5

gooddata/zuul,devdattakulkarni/zuul_messaging,devdattakulkarni/zuul_messaging,gooddata/zuul,devdattakulkarni/zuul_messaging,gooddata/zuul,wikimedia/integration-zuul,gooddata/zuul,wikimedia/integration-zuul,wikimedia/integration-zuul,wikimedia/integration-zuul,gooddata/zuul