Added Memcached dependency installation in workspace Dockerfile.
Added Memcached dependency installation in workspace Dockerfile.

jinnawat/laradock,jinnawat/laradock,bestlong/laradock,hnquang112/laradock,bestlong/laradock,hnquang112/laradock,bestlong/laradock,LaraDock/laradock,jinnawat/laradock,jinnawat/laradock,bestlong/laradock,hnquang112/laradock,hnquang112/laradock,bestlong/laradock