Fix typo in build instructions
Fix typo in build instructions

aldhsu/ember-collection,paddyobrien/ember-collection,alexdiliberto/ember-collection,nkgm/ember-collection,aldhsu/ember-collection,mrinterweb/ember-collection,alexdiliberto/ember-collection,nkgm/ember-collection,emberjs/ember-collection,flexyford/ember-collection,arenoir/ember-collection,paddyobrien/ember-collection,emberjs/ember-collection,arenoir/ember-collection,mrinterweb/ember-collection,flexyford/ember-collection