Reverts Lumen to v5.1.3
Reverts Lumen to v5.1.3

Lumen got upgraded to v5.1.4 when running composer update to bring in
the forked revisionable repository. Currently Spira is not fully
compatible with the update, the custom validator needs some adjustments
before bringing in 5.1.4.

spira/spira,spira/spira,spira/spira,spira/spira,spira/spira