remove redundant and possibly problematic version check
remove redundant and possibly problematic version check

This check should be redundant, given that our package.json already declares the same semantic requirement. And it seems to be causing problems (possibly due to differences in addon nesting structure or npm tree structure) as in https://github.com/ember-animation/liquid-fire/issues/503

ember-animation/ember-animated,ember-animation/liquid-fire,ember-animation/ember-animated,jrjohnson/liquid-fire,ember-animation/liquid-fire,ef4/liquid-fire,ef4/liquid-fire,jrjohnson/liquid-fire,ember-animation/ember-animated