Upgrade symfony in lockfile to be 2.8 which is supported version of 2…#12633

Merged

eileenmcnaughton merged 2 commits intocivicrm:masterfrom seamuslee001:symfony_upgrade

Aug 8, 2018

+227-94

Commits on Aug 7, 2018

Upgrade symfony in lockfile to be 2.8 which is supported version of 2.x series
seamuslee001
committed

Commits on Aug 8, 2018

Update Unit test to ensure it locks in 2.8 and include polyfil
seamuslee001
committed