chore(test): fix tests (align angular core packages versions for v4.0.0)
chore(test): fix tests (align angular core packages versions for v4.0.0)

tinesoft/ng2-sharebuttons,MurhafSousli/ng2-sharebuttons,MurhafSousli/ng2-sharebuttons,MurhafSousli/ng2-sharebuttons,tinesoft/ng2-sharebuttons,tinesoft/ng2-sharebuttons