composer.local.json has wrong syntax

[rht]

It should be

{
    "require": {
        "mediawiki/maps": "~8.0",
        "mediawiki/semantic-media-wiki": "~3.2",
        "mediawiki/semantic-result-formats": "~3.1",
        "rht/merkle-tree": "dev-master"
    }
}