Update EasyAlign config for `:`

[krampstudio]

When aligning the following sample :

{
    foo : 'bar',
    longFooToAlign: true,
    mediumFoo : 12
}

using : :EasyAlign :, I have

{
    foo:            'bar',
    longFooToAlign: true,
    mediumFoo:      12
}

but I'd like it to produce the following alignment

{
    foo             : 'bar',
    longFooToAlign  : true,
    mediumFoo       : 12
}

EasyAlign already align that way for =.